makepkg: remove srclinks directory on error exit

When makepkg exits in create_srcpackage(), the (temporary) srclinks
directory is left behind.

Signed-off-by: Cedric Staniewski <cedric@gmx.ca>
Signed-off-by: Allan McRae <allan@archlinux.org>
Signed-off-by: Dan McGee <dan@archlinux.org>

scripts/makepkg.sh.in

@@ -118,6 +118,7 @@ trap_exit() {
 		echo
 		error "$@"
 	fi
+	[[ -n $srclinks ]] && rm -rf "$srclinks"
 	exit 1
 }