avahi-discover: make this build with gtk+3>=3.10.

srcpkgs/avahi-discover/template

@@ -32,6 +32,15 @@ if [ "$CROSS_BUILD" ]; then
 	msg_error "$pkgver: this package is not cross buildable currently.\n"
 fi
 
+pre_configure() {
+	# Disable GTK deprecations and -Werror to let this build with gtk+>=3.10.
+	sed -e 's,-DG_DISABLE_DEPRECATED=1,,' \
+		-e 's,-DGDK_DISABLE_DEPRECATED=1,,' \
+		-e 's,-DGTK_DISABLE_DEPRECATED=1,,' \
+		-i avahi-ui/Makefile.in
+	sed -e 's,-Werror,,g' -i configure
+}
+
 avahi-python-utils_package() {
 	noarch=yes
 	depends="avahi-python>=$version"