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[libc] Add toascii

We already have isascii() and to* is reserved namespace so let's
add it.

--- a/include/ctype.h

+++ b/include/ctype.h

@@ -41,5 +41,6 @@

 #define isxdigit(c) ((__ctype+1)[c] & (_D|_X))

 #define isascii(c) ((unsigned)(c)<=0x7f)

+#define toascii(c) ((unsigned)(c)&0x7f)

 #endif

--- a/src/libc/ctype/Makefile

+++ b/src/libc/ctype/Makefile

@@ -17,6 +17,7 @@

        isspace.o\

        isupper.o\

        isxdigit.o\

+       toascii.o\

        tolower.o\

        toupper.o\

--- /dev/null

+++ b/src/libc/ctype/toascii.c

@@ -1,0 +1,8 @@

+#include <ctype.h>

+#undef toascii

+

+int

+toascii(int c)

+{

+	return c & 0x7f;

+}