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[libc] Add strlen()

--- a/libc/src/Makefile

+++ b/libc/src/Makefile

@@ -1,7 +1,7 @@

 # See LICENSE file for copyright and license details.

 .POSIX:

-LIBCOBJ = assert.o strcpy.o strcmp.o

+LIBCOBJ = assert.o strcpy.o strcmp.o strlen.o

 all: libc.a

--- /dev/null

+++ b/libc/src/strlen.c

@@ -1,0 +1,13 @@

+/* See LICENSE file for copyright and license details. */

+

+#include <string.h>

+

+size_t

+strlen(const char *s)

+{

+	const char *t;

+

+	for (t = s; *t; ++t)

+		/* nothing */;

+	return t - s;

+}