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libc: Fix all the constness problems

The const warnings were ignored based in wrong assumptions about how
the C standard specifies the type qualifier behaviour related to
pointers.

--- a/include/bits/darwin/sys.h

+++ b/include/bits/darwin/sys.h

@@ -23,7 +23,7 @@

 struct sigaction;

 struct rusage;

-extern int _execve(char *, char *[], char *[]);

+extern int _execve(const char *, const char *[], const char *[]);

 extern int _fork(void);

 extern pid_t _getpid(void);

 extern int _kill(pid_t, int);

--- a/include/bits/dragonfly/sys.h

+++ b/include/bits/dragonfly/sys.h

@@ -23,7 +23,7 @@

 struct sigaction;

 struct rusage;

-extern int _execve(char *, char *[], char *[]);

+extern int _execve(const char *, const char *[], const char *[]);

 extern int _fork(void);

 extern pid_t _getpid(void);

 extern int _kill(pid_t, int);

--- a/include/bits/linux/sys.h

+++ b/include/bits/linux/sys.h

@@ -23,7 +23,7 @@

 struct sigaction;

 struct rusage;

-extern int _execve(char *, char *[], char *[]);

+extern int _execve(const char *, const char *[], const char *[]);

 extern int _fork(void);

 extern pid_t _getpid(void);

 extern int _kill(pid_t, int);

--- a/include/bits/netbsd/sys.h

+++ b/include/bits/netbsd/sys.h

@@ -23,7 +23,7 @@

 struct sigaction;

 struct rusage;

-extern int _execve(char *, char *[], char *[]);

+extern int _execve(const char *, const char *[], const char *[]);

 extern int _fork(void);

 extern pid_t _getpid(void);

 extern int _kill(pid_t, int);

--- a/include/bits/openbsd/sys.h

+++ b/include/bits/openbsd/sys.h

@@ -23,7 +23,7 @@

 struct sigaction;

 struct rusage;

-extern int _execve(char *, char *[], char *[]);

+extern int _execve(const char *, const char *[], const char *[]);

 extern int _fork(void);

 extern pid_t _getpid(void);

 extern int _kill(pid_t, int);

--- a/src/libc/arch/posix/getenv.c

+++ b/src/libc/arch/posix/getenv.c

@@ -3,17 +3,17 @@

 #undef getenv

-extern char **_environ;

+extern const char **_environ;

 char *

 getenv(const char *name)

 {

-	char **p, *s;

+	const char **p, *s;

 	size_t len = strlen(name);

 	for (p = _environ; s = *p; ++p) {

 		if (!strncmp(name, s, len) && s[len] == '=')

-			return s + len + 1;

+			return (char *) s + len + 1;

 	}

 	return NULL;

 }

--- a/src/libc/arch/posix/system.c

+++ b/src/libc/arch/posix/system.c

@@ -9,7 +9,7 @@

 #undef system

-extern char **_environ;

+extern const char **_environ;

 int

 system(const char *cmd)

@@ -24,7 +24,7 @@

 	case -1:

 		return -1;

 	case 0:

-		_execve(SHELL, (char*[]) {"sh", "-c", cmd, NULL}, _environ);

+		_execve(SHELL, (const char*[]) {"sh", "-c", cmd, NULL}, _environ);

 		_exit(127);

 	default:

 		while (_waitpid(pid, &st, 0) < 0 && errno == EINTR)

--- a/src/libc/stdlib/bsearch.c

+++ b/src/libc/stdlib/bsearch.c

@@ -7,7 +7,7 @@

 {

 	int t;

 	size_t mid, low, high;

-	char *cur, *base = ary;

+	char *cur, *base = (char *) ary;

 	low = 0;

 	high = n - 1;

--- a/src/libc/stdlib/strtol.c

+++ b/src/libc/stdlib/strtol.c

@@ -9,11 +9,11 @@

 #undef strtol

 long

-strtol(const char * restrict s, char ** restrict end, int base)

+strtol(const char * restrict ptr, char ** restrict end, int base)

 {

 	int d, sign = -1;

 	long n;

-	const char *t;

+	char *t, *s = (char *) ptr;

 	if (end)

 		*end = s;

--- a/src/libc/stdlib/strtoll.c

+++ b/src/libc/stdlib/strtoll.c

@@ -9,11 +9,11 @@

 #undef strtoll

 long long

-strtoll(const char * restrict s, char ** restrict end, int base)

+strtoll(const char * restrict ptr, char ** restrict end, int base)

 {

 	int d, sign = -1;

 	long long n;

-	const char *t;

+	char *t, *s = (char *) ptr;

 	if (end)

 		*end = s;

--- a/src/libc/stdlib/strtoul.c

+++ b/src/libc/stdlib/strtoul.c

@@ -9,11 +9,11 @@

 #undef strtoul

 unsigned long

-strtoul(const char * restrict s, char ** restrict end, int base)

+strtoul(const char * restrict ptr, char ** restrict end, int base)

 {

 	int d, sign = 1;

 	unsigned long n;

-	const char *t;

+	char *t, *s = (char *) ptr;

 	if (end)

 		*end = s;

--- a/src/libc/stdlib/strtoull.c

+++ b/src/libc/stdlib/strtoull.c

@@ -9,11 +9,11 @@

 #undef strtoull

 unsigned long long

-strtoull(const char * restrict s, char ** restrict end, int base)

+strtoull(const char * restrict ptr, char ** restrict end, int base)

 {

 	int d, sign = 1;

 	unsigned long long n;

-	const char *t;

+	char *t, *s = (char *) ptr;

 	if (end)

 		*end = s;

--- a/src/libc/string/memchr.c

+++ b/src/libc/string/memchr.c

@@ -5,7 +5,7 @@

 void *

 memchr(const void *s, int c, size_t n)

 {

-	const unsigned char *bp = s;

+	unsigned char *bp = (unsigned char *) s;

 	while (n > 0 && *bp++ != c)

 		--n;

--- a/src/libc/string/strchr.c

+++ b/src/libc/string/strchr.c

@@ -8,5 +8,5 @@

 	while (*s && *s != c)

 		++s;

-	return (*s == c) ? s : NULL;

+	return (*s == c) ? (char *) s : NULL;

 }

--- a/src/libc/string/strpbrk.c

+++ b/src/libc/string/strpbrk.c

@@ -16,5 +16,5 @@

 	while ((ch = *s) != 0 && !map[ch])

 		s++;

-	return (ch == '\0') ? NULL : s;

+	return (ch == '\0') ? NULL : (char *) s;

 }

--- a/src/libc/string/strrchr.c

+++ b/src/libc/string/strrchr.c

@@ -12,5 +12,5 @@

 	while (t > s && *t != c)

 		--t;

-	return (*t == c) ? t : NULL;

+	return (*t == c) ? (char *) t : NULL;

 }

--- a/src/libc/string/strstr.c

+++ b/src/libc/string/strstr.c

@@ -11,11 +11,11 @@

 	int len;

 	if ((len = strlen(s2)) == 0)

-		return s1;

+		return (char *) s1;

 	for (p = s1; p = strchr(p, c); ++p) {

 		if (!strncmp(p, s2, len))

-			return p;

+			return (char *) p;

 	}

 	return NULL;