File rpmrebuild-fix-bashisms.patch of Package rpmrebuild

diff -Ndur a/plugins/demofiles.sh b/plugins/demofiles.sh
--- a/plugins/demofiles.sh	2017-09-16 11:54:46.161483014 +0200
+++ b/plugins/demofiles.sh	2017-09-16 11:56:41.910200886 +0200
@@ -25,11 +25,11 @@
 # with a file plugin
 version=1.1
 ###############################################################################
-function msg () {
+msg () {
 	echo >&2 $*
 }
 ###############################################################################
-function syntaxe () {
+syntaxe () {
 	msg "this plugin just show how to modifiy files"
 	msg "it must be called with --change-files option"
 	msg "-h|--help : this help"