fix libwebp namings

Author: weltling

ext/gd/config.w32

@@ -23,7 +23,7 @@ if (PHP_GD != "no") {
 		) {
 
 		if (PHP_LIBWEBP != "no") {
-			if (CHECK_LIB("libwebp.lib", "gd", PHP_GD) &&
+			if ((CHECK_LIB("libwebp_a.lib", "gd", PHP_GD) || CHECK_LIB("libwebp.lib", "gd", PHP_GD)) &&
 				CHECK_HEADER_ADD_INCLUDE("decode.h", "CFLAGS_GD", PHP_GD + ";" + PHP_PHP_BUILD + "\\include\\webp") &&
 				CHECK_HEADER_ADD_INCLUDE("encode.h", "CFLAGS_GD", PHP_GD + ";" + PHP_PHP_BUILD + "\\include\\webp")) {
 				ADD_FLAG("CFLAGS_GD", "/D HAVE_LIBWEBP /D HAVE_GD_WEBP");