Fix Bash Brace Expansion

It bug appeared in Debian and Trisquel

Makefile.example

@@ -82,8 +82,7 @@ else
 endif
 
 vendor:
-	rm -rf output/{de,en,eo,fr}/vendor/
+	@bash $(BASEDIR)/scripts/vendor.sh
-	xargs -n 1 cp -pPR content/vendor/<<<"output/de output/en output/eo output/fr"
 
 stopserver:
 	$(BASEDIR)/develop_server.sh stop

scripts/vendor.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+run_vendor()
+{
+
+local LOCALDIR="${2-$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)}"
+local BASE="${LOCALDIR%scripts}" # input
+
+rm -rf "$BASE"/output/{de,en,eo,fr}/vendor/
+
+echo "$BASE"output/{de,en,eo,fr} | xargs -n 1 cp -rf "$BASE"/output/vendor
+
+}
+
+# ==============================================================================
+# EXECUTION - START
+# ==============================================================================
+run_vendor "$@"