tint: update the tint build system to fix the download/patch errors

Restore the tint build system compatibility with the current version
of buildgcc script while preserving the backwards compatibility.

Change-Id: I45d3454b4527ee81c3927a5b3da2e9067c530fb0
Signed-off-by: Mike Banon <mikebdp2@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76819
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

payloads/external/tint/generate_core.sh

@@ -97,6 +97,7 @@ sed -i -e "s/util\/crossgcc\///g" "$corescript"
 
 if [ ! -z "${prepare_before_patch}" ] ; then
 	sed -i -e "/\$TAR \$FLAGS \"\$(basename \"\$archive\")\"/a prepare_\${package} || exit \"\$?\"" "$corescript"
+	sed -i -e "/\$TAR \$FLAGS \"\$archive\"/a prepare_\${package} || exit \"\$?\"" "$corescript"
 fi
 
 #