Remove old check

Author: laruence

config.m4

@@ -1,22 +1,5 @@
 dnl config.m4 for extension msgpack
 
-dnl Comments in this file start with the string 'dnl'.
-dnl Remove where necessary. This file will not work
-dnl without editing.
-
-dnl Check PHP version:
-
-AC_MSG_CHECKING(PHP version)
-AC_TRY_COMPILE([#include "$phpincludedir/main/php_version.h"], [
-#if PHP_MAJOR_VERSION < 5
-#error  this extension requires at least PHP version 5 or newer
-#endif
-],
-[AC_MSG_RESULT(ok)],
-[AC_MSG_ERROR([need at least PHP 5 or newer])])
-
-dnl If your extension references something external, use with:
-
 PHP_ARG_WITH(msgpack, for msgpack support,
 Make sure that the comment is aligned:
 [  --with-msgpack             Include msgpack support])