fastsync: added warning

wine-tkg-git/wine-tkg-patches/misc/fastsync/fastsync

@@ -4,6 +4,7 @@
 	if [ "$_use_fastsync" = "true" ] || [ "$_use_ntsync" = "true" ] && [[ "$_custom_wine_source" = *"ValveSoftware"* ]]; then # not allowed on Valve tree
 	  error "NTsync/Winesync is not currently supported on Valve trees. It'll be forcibly disabled."
 	elif [ "$_use_fastsync" = "true" ]; then
+	  warning "fastsync/Winesync is deprecated and unmaintained and thus its use is discouraged - You're invited to move to its newer NTsync iteration"
 	  # check Linux headers
 	  winesync_header_check=$(echo '#include <linux/winesync.h>' | gcc -H -E -fsyntax-only - 2>&1 | head -n1 | cut -d' ' -f2-)
 	  if [[ ! -s $winesync_header_check ]]; then