udp: Fix compiler warning on mingw-w64

Fixes: #652144.
gstudpnetutils.h:32:0: error: "WINVER" redefined
/usr/i686-w64-mingw32/sys-root/mingw/include/_mingw.h:231:0: note: this is the
location of the previous definition

diff --git a/gst/udp/gstudpnetutils.h b/gst/udp/gstudpnetutils.h
index ec863bd..9b52ed9 100644 (file)
--- a/gst/udp/gstudpnetutils.h
+++ b/gst/udp/gstudpnetutils.h
@@ -29,7 +29,9 @@
 #ifdef G_OS_WIN32
 /* ws2_32.dll has getaddrinfo and freeaddrinfo on Windows XP and later.
  * minwg32 headers check WINVER before allowing the use of these */
+#ifndef WINVER
 #define WINVER 0x0501
+#endif
 #include <winsock2.h>
 #include <ws2tcpip.h>
 #ifndef socklen_t