windowscodecs: Suppress libtiff warnings.

dlls/windowscodecs/tiffformat.c

@@ -67,6 +67,8 @@ MAKE_FUNCPTR(TIFFReadEncodedStrip);
 MAKE_FUNCPTR(TIFFReadEncodedTile);
 MAKE_FUNCPTR(TIFFSetDirectory);
 MAKE_FUNCPTR(TIFFSetField);
+MAKE_FUNCPTR(TIFFSetWarningHandler);
+MAKE_FUNCPTR(TIFFSetWarningHandlerExt);
 MAKE_FUNCPTR(TIFFWriteDirectory);
 MAKE_FUNCPTR(TIFFWriteScanline);
 #undef MAKE_FUNCPTR
@@ -99,6 +101,8 @@ static void *load_libtiff(void)
         LOAD_FUNCPTR(TIFFReadEncodedTile);
         LOAD_FUNCPTR(TIFFSetDirectory);
         LOAD_FUNCPTR(TIFFSetField);
+        LOAD_FUNCPTR(TIFFSetWarningHandler);
+        LOAD_FUNCPTR(TIFFSetWarningHandlerExt);
         LOAD_FUNCPTR(TIFFWriteDirectory);
         LOAD_FUNCPTR(TIFFWriteScanline);
 #undef LOAD_FUNCPTR
@@ -107,6 +111,9 @@ static void *load_libtiff(void)
 
     result = libtiff_handle;
 
+    pTIFFSetWarningHandler(NULL);
+    pTIFFSetWarningHandlerExt(NULL);
+
     LeaveCriticalSection(&init_tiff_cs);
     return result;
 }