WINGs/wrlib: Remove deprecated get-*-flags scripts.

These have been replaced by pkg-config.  Christophe left a note in January
2015 to remove them, and this time has now passed.

doc/Makefile.am

@@ -6,9 +6,6 @@ DIST_SUBDIRS = build cs ru sk
 dist_man_MANS = \
 	geticonset.1 \
 	getstyle.1 \
-	get-wings-flags.1 \
-	get-wraster-flags.1 \
-	get-wutil-flags.1 \
 	seticons.1 \
 	setstyle.1 \
 	upgrade-windowmaker-defaults.8 \