Filter out soname provides for mozilla gmp plugin

Both mozilla-openh264 and openh264 otherwise provide
libopenh264.so.7()(64bit) - this is certainly an issue with the build
scripts that incorrectly set the soname for the gmp plugin, but
regardless of that there is no point in having virtual provides for a
plugin soname that is not in the linker search path.

openh264.spec

@@ -6,6 +6,9 @@
 %global openh264_version 2.4.0
 %global gst_version 1.22.1
 
+# Filter out soname provides for the mozilla plugin
+%global __provides_exclude_from ^%{_libdir}/mozilla/plugins/
+
 Name:           openh264
 Version:        %{openh264_version}
 # Also bump the Release tag for gstreamer1-plugin-openh264 down below
@@ -237,6 +240,7 @@ popd
 %changelog
 * Mon Dec 04 2023 Kalev Lember <klember@redhat.com> - 2.4.0-2
 - Fix off by one regression in decoder
+- Filter out soname provides for mozilla gmp plugin
 
 * Fri Nov 24 2023 Kalev Lember <klember@redhat.com> - 2.4.0-1
 - Update to 2.4.0