Red Bear OS relibc baseline

From release 0.1.0 pre-patched archive.
This includes all Red Bear modifications previously maintained
as patches in local/patches/relibc/.

tests/string/strchr.c

@@ -0,0 +1,11 @@
+#include <string.h>
+#include <stdio.h>
+
+#include "test_helpers.h"
+
+int main(void) {
+	printf("%s\n", strchr("hello", 'e')); // should be ello
+	printf("%s\n", strchr("world", 'l')); // should be ld
+	printf("%s\n", strchr("world", '\0')); // should be an empty, nul-terminated string
+	printf("%p\n", strchr("world", 'x')); // should be a null pointer
+}