Add a few things necessary for openssl (not all)

tests/string/strchr.c

@@ -4,7 +4,7 @@
 int main(int argc, char* argv[]) {
 	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 ''
+	printf("%i\n", strchr("world", 0) == NULL); // should be 1
 
     return 0;
 }