0.3.0: converge relibc to upstream 0.6.0 + Red Bear patches

tests/stdlib/mktemp.c

@@ -7,7 +7,10 @@
 int main(void) {
     char* string = (char*) calloc(20, sizeof(char));
     strcpy(string, "tempXXXXXX");
+    #pragma GCC diagnostic push
+    #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
     mktemp(string);
+    #pragma GCC diagnostic pop
     printf("%s\n",string);
     free(string);
 }