Put comment about std argument in its place

Author: alcaeus

config.m4

@@ -266,6 +266,7 @@ if test "$PHP_MONGODB" != "no"; then
 
   if test "$PHP_LIBBSON" = "no" -a "$PHP_LIBMONGOC" = "no"; then
     PHP_MONGODB_BUNDLED_CFLAGS="$STD_CFLAGS -DBSON_COMPILATION -DMONGOC_COMPILATION"
+    dnl TODO: MONGOCRYPT-219 makes the -std argument obsolete
     PHP_MONGODB_LIBMONGOCRYPT_CFLAGS="$PHP_MONGODB_BUNDLED_CFLAGS -std=gnu99"
 
     dnl M4 doesn't know if we're building statically or as a shared module, so
@@ -385,8 +386,6 @@ if test "$PHP_MONGODB" != "no"; then
     fi
 
     if test "$PHP_CLIENT_SIDE_ENCRYPTION" = "yes"; then
-      dnl TODO: MONGOCRYPT-219 makes the -std argument obsolete
-
       AC_SUBST(MONGOCRYPT_ENABLE_TRACE, 1)
       AC_SUBST(MONGOCRYPT_IS_POSIX, 1)
       AC_SUBST(MONGOCRYPT_IS_WIN, 0)