Drop PHP major version from source files

While it may make some sense to have the PHP major version in the names
of the binaries[1], there is no reason to have it in the names of the
source files.

[1] <php#3769>

Author: cmb69

sapi/isapi/config.w32

@@ -6,7 +6,7 @@ if (PHP_ISAPI == "yes") {
 	if (PHP_ZTS == "no") {
 		WARNING("ISAPI module requires an --enable-zts build of PHP");
 	} else {
-		SAPI('isapi', 'php7isapi.c', 'php' + PHP_VERSION + 'isapi.dll', '/D PHP7ISAPI_EXPORTS /DZEND_ENABLE_STATIC_TSRMLS_CACHE=1');
-		ADD_FLAG('LDFLAGS_ISAPI', '/DEF:sapi\\isapi\\php7isapi.def');
+		SAPI('isapi', 'php_isapi.c', 'php' + PHP_VERSION + 'isapi.dll', '/D PHP7ISAPI_EXPORTS /DZEND_ENABLE_STATIC_TSRMLS_CACHE=1');
+		ADD_FLAG('LDFLAGS_ISAPI', '/DEF:sapi\\isapi\\php_isapi.def');
 	}
 }