Add DMABufObject only when GBM is enabled.

Remove when https://bugs.webkit.org/show_bug.cgi?id=275297 is fixed upstream.

Author: magomez

Source/WebKit/PlatformWPE.cmake

@@ -104,8 +104,11 @@ list(APPEND WebKit_UNIFIED_SOURCE_LIST_FILES
 
 list(APPEND WebKit_SERIALIZATION_IN_FILES Shared/glib/DMABufRendererBufferFormat.serialization.in)
 
+if (USE_GBM)
+  list(APPEND WebKit_SERIALIZATION_IN_FILES Shared/glib/DMABufObject.serialization.in)
+endif ()
+
 list(APPEND WebKit_SERIALIZATION_IN_FILES
-    Shared/glib/DMABufObject.serialization.in
     Shared/glib/DMABufRendererBufferMode.serialization.in
     Shared/glib/InputMethodState.serialization.in
     Shared/glib/UserMessage.serialization.in