REGRESSION(302293@main): [WPE] Build broken when targeting Android

https://bugs.webkit.org/show_bug.cgi?id=301920

Reviewed by Sergio Villar Senin.

* Source/WebKit/WebProcess/WebPage/glib/WebPageGLib.cpp:
(WebKit::WebPage::getRenderProcessInfo): Add a missing USE(GBM) guard
to avoid accessing the .modifiers field when it is not available.

Canonical link: https://commits.webkit.org/302533@main

Author: aperezdc

Source/WebKit/WebProcess/WebPage/glib/WebPageGLib.cpp

@@ -293,7 +293,14 @@ void WebPage::getRenderProcessInfo(CompletionHandler<void(RenderProcessInfo&&)>&
 
     if (info.platform != "WPE"_s) {
         info.supportedBufferFormats = display->bufferFormats().map([](const auto& format) -> RendererBufferFormat::Format {
-            return { format.fourcc.value, format.modifiers };
+            return {
+                format.fourcc.value,
+#if USE(GBM)
+                format.modifiers,
+#else
+                { },
+#endif
+            };
         });
     }