win32: don't override _WIN32_WINNT if a more recent one is defined

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/audio_output/mmdevice.c

@@ -18,7 +18,11 @@
  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  *****************************************************************************/
 
-#define _WIN32_WINNT 0x600
+#if !defined(_WIN32_WINNT) || _WIN32_WINNT < 0x600
+# undef _WIN32_WINNT
+# define _WIN32_WINNT 0x600
+#endif
+
 #ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif

modules/audio_output/wasapi.c

@@ -18,7 +18,11 @@
  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  *****************************************************************************/
 
-#define _WIN32_WINNT 0x600
+#if !defined(_WIN32_WINNT) || _WIN32_WINNT < 0x600
+# undef _WIN32_WINNT
+# define _WIN32_WINNT 0x600
+#endif
+
 #ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif

modules/video_output/msw/win32touch.h

@@ -24,10 +24,10 @@
 #ifndef VLC_GESTURE_H_
 #define VLC_GESTURE_H_
 
-# ifdef _WIN32_WINNT
+# if !defined(_WIN32_WINNT) || _WIN32_WINNT < 0x601
 #  undef _WIN32_WINNT
-# endif
 #  define _WIN32_WINNT 0x0601
+# endif
 # include <windows.h>
 # include <winuser.h>