Include stddef.h instead of sys/types.h.

The include is required for type size_t. stddef.h should be available
on every platform, sys/types.h is not.

PR-URL: https://github.com/nodejs/http-parser/pull/360
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

http_parser.h

@@ -29,11 +29,10 @@ extern "C" {
 #define HTTP_PARSER_VERSION_MINOR 7
 #define HTTP_PARSER_VERSION_PATCH 1
 
-#include <sys/types.h>
+#include <stddef.h>
 #if defined(_WIN32) && !defined(__MINGW32__) && \
   (!defined(_MSC_VER) || _MSC_VER<1600) && !defined(__WINE__)
 #include <BaseTsd.h>
-#include <stddef.h>
 typedef __int8 int8_t;
 typedef unsigned __int8 uint8_t;
 typedef __int16 int16_t;