Add stdio header

Author: hctim

compiler-rt/lib/gwp_asan/platform_specific/utilities_fuchsia.cpp

@@ -10,6 +10,7 @@
 
 #include <alloca.h>
 #include <inttypes.h>
+#include <stdio.h>
 #include <string.h>
 #include <zircon/sanitizer.h>