firefox: Fix gkrust build error

1.  https://hg.mozilla.org/integration/autoland/rev/bb79da633a2e
2.  https://bugzilla.mozilla.org/show_bug.cgi?id=1640982

Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>

firefox.be0

@@ -7,6 +7,8 @@
 #https://ftp.mozilla.org/pub/firefox/releases/$pkgversion/SOURCE to find the right download link
 SRCURL[0]="https://ftp.mozilla.org/pub/firefox/releases/${PKGVERSION}/source/firefox-${PKGVERSION}.source.tar.xz"
 
+PATCHURL+=(/src/mariux/patches/firefox-79-gkrust-build-error.patch)
+
 #BEE_BUILDTYPE=autotools
 #build_in_sourcedir