WUtil: mark the script 'get-wutil-flags' as deprecated

This script should have been removed a long time ago, in favour of
pkg-config which has to be present anyway to compile Window Maker.

This patch makes the script print a warning about it, and now calls itself
pkg-config, instead of being generated; the man page was also updated
accordingly (and spell-checked).

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>

WINGs/get-wutil-flags

@@ -0,0 +1,33 @@
+#!/bin/sh
+
+# [Christophe CURIS, 2015/01/31]
+# This script is now reporting itself as deprecated (this should have been done
+# a long time ago), so it should be kept for at least 2 years from now in order
+# to allow users to update their scripts, and then removed.
+
+if test $# -eq 0; then
+      echo "Error: $0 is deprecated, please use 'pkg-config WUtil ...'" >&2
+      exit 1
+fi
+
+while test $# -gt 0; do
+  case $1 in
+    --cflags)
+        echo "Warning: $0 is deprecated, please use 'pkg-config WUtil --cflags'" >&2
+	pkg-config WUtil --cflags
+        ;;
+    --ldflags|--lflags)
+	echo "Warning: $0 is deprecated, please use 'pkg-config WUtil --libs'" >&2
+        pkg-config WUtil --libs-only-L
+        ;;
+    --libs)
+	echo "Warning: $0 is deprecated, please use 'pkg-config WUtil --libs'" >&2
+        pkg-config WUtil --libs
+        ;;
+    *)
+	echo "Error: $0 is deprecated, please use 'pkg-config WUtil ...'" >&2
+	exit 1
+	;;
+  esac
+  shift
+done