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[libc] Add strcat()

--- a/libc/src/Makefile

+++ b/libc/src/Makefile

@@ -2,7 +2,7 @@

 .POSIX:

 LIBCOBJ = assert.o strcpy.o strcmp.o strlen.o strchr.o \

-          strrchr.o

+          strrchr.o strcat.o

 all: libc.a

--- /dev/null

+++ b/libc/src/strcat.c

@@ -1,0 +1,15 @@

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

+

+#include <string.h>

+

+char *

+strcat(char *dst, const char *src)

+{

+	char *ret;

+

+	for (ret = dst; *dst; ++dst)

+		/* nothing */;

+	while (*dst++ = *src++)

+		/* nothing */;

+	return ret;

+}