Merge pull request #12439 from nicolasnoble/compilers-be-compilers

Quick compilation fix.

src/core/lib/support/string.c

@@ -300,11 +300,12 @@ void *gpr_memrchr(const void *s, int c, size_t n) {
 }
 
 bool gpr_is_true(const char *s) {
+  size_t i;
   if (s == NULL) {
     return false;
   }
   static const char *truthy[] = {"yes", "true", "1"};
-  for (size_t i = 0; i < GPR_ARRAY_SIZE(truthy); i++) {
+  for (i = 0; i < GPR_ARRAY_SIZE(truthy); i++) {
     if (0 == gpr_stricmp(s, truthy[i])) {
       return true;
     }