Remove gtk2 support as flash plugin is no longer supported

ESR91 is supposed to drop gtk2 support, but in the mean time, we can
just rm the gtk2 libmozgtk.so as we are using gtk3 by default. The last
supported plugin -- adobe flash -- is no longer supported in Firefox 85,
so we no longer need to keep the gtk2 libmozgtk around for the plugin
loader.

https://pagure.io/fedora-workstation/issue/180

firefox.spec

@@ -174,7 +174,7 @@ ExcludeArch: armv7hl
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
 Version:        85.0
-Release:        9%{?pre_tag}%{?dist}
+Release:        10%{?pre_tag}%{?dist}
 URL:            https://www.mozilla.org/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Source0:        https://archive.mozilla.org/pub/firefox/releases/%{version}%{?pre_version}/source/firefox-%{version}%{?pre_version}.source.tar.xz
@@ -929,6 +929,9 @@ mkdir -p %{buildroot}%{_datadir}/metainfo
 mkdir -p %{buildroot}%{_datadir}/gnome-shell/search-providers
 %{__cp} %{SOURCE34} %{buildroot}%{_datadir}/gnome-shell/search-providers
 
+# Remove gtk2 support as flash plugin is no longer supported
+rm -rf %{buildroot}%{mozappdir}/gtk2/
+
 # Remove copied libraries to speed up build
 rm -f %{buildroot}%{mozappdirdev}/sdk/lib/libmozjs.so
 rm -f %{buildroot}%{mozappdirdev}/sdk/lib/libmozalloc.so
@@ -1023,7 +1026,6 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 %{mozappdir}/browser/crashreporter-override.ini
 %endif
 %{mozappdir}/*.so
-%{mozappdir}/gtk2/*.so
 %{mozappdir}/defaults/pref/channel-prefs.js
 %{mozappdir}/dependentlibs.list
 %{mozappdir}/dictionaries
@@ -1042,6 +1044,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
+* Tue Feb 02 2021 Kalev Lember <klember@redhat.com> - 85.0-10
+- Remove gtk2 support as flash plugin is no longer supported
+
 * Sat Jan 30 2021 Martin Stransky <stransky@redhat.com> - 85.0-9
 - Enable WebRender on KDE/Wayland and AMD/Intel drivers.