add check for setlocale in C library

Microsoft CRT and glibc have setlocale, but bionic doesn't

src/check/check_setlocale.c

@@ -0,0 +1,7 @@
+#include <locale.h>
+
+int main(int, char**) {
+  setlocale(LC_CTYPE,"");
+  setlocale(LC_MESSAGES,"");
+  return 0;
+}