Remove various meson toggles that match with upstream defaults

... as suggested by Company.

Resolves: #2021061

(cherry picked from Fedora commit eaf1da5e7c)

gtk4.spec

@@ -110,15 +110,9 @@ for writing applications with version 4 of the GTK widget toolkit.
 %build
 export CFLAGS='-fno-strict-aliasing -DG_DISABLE_CAST_CHECKS -DG_DISABLE_ASSERT %optflags'
 %meson \
-        -Dx11-backend=true \
-        -Dwayland-backend=true \
 %if 0%{?with_broadway}
         -Dbroadway-backend=true \
 %endif
-        -Dmedia-ffmpeg=disabled \
-        -Dmedia-gstreamer=enabled \
-        -Dvulkan=disabled \
-        -Dxinerama=enabled \
         -Dsysprof=enabled \
         -Dcolord=enabled \
         -Dgtk_doc=false \