xbps-src: added setup_subpkg_tmpl() to setup subpkg tmpls.

xbps-src/shutils/tmpl_funcs.sh.in

@@ -140,6 +140,24 @@ setup_tmpl()
 
 }
 
+setup_subpkg_tmpl()
+{
+	[ -z "$1" ] && return 1
+
+	if [ -r "$XBPS_SRCPKGDIR/$1/$1.template" ]; then
+		setup_tmpl $1
+		unset run_depends
+		. $XBPS_SRCPKGDIR/$1/$1.template
+		for f in ${subpackages}; do
+			if [ "$subpkg" = "$1" ]; then
+				pkgname=$subpkg
+				set_tmpl_common_vars
+				break
+			fi
+		done
+	fi
+}
+
 check_builddep_dup()
 {
 	local dep="$1" i