Fix CQS signal facebook-unused-include-check in fbcode/hphp/runtime/ext/pcre

Reviewed By: dtolnay

Differential Revision: D75432837

fbshipit-source-id: 87fce7442b7add5dc954c65fcbb649701caa3e26

Author: generatedunixname89002005287564

hphp/runtime/ext/pcre/ext_pcre.cpp

@@ -23,7 +23,6 @@
 #include <pcre.h>
 
 #include "hphp/runtime/ext/mbstring/ext_mbstring.h"
-#include "hphp/runtime/ext/std/ext_std_function.h"
 #include "hphp/runtime/ext/string/ext_string.h"
 #include "hphp/runtime/base/array-iterator.h"
 #include "hphp/runtime/base/container-functions.h"