build: drop unused ALLMANPAGES variable

Makefile

@@ -28,7 +28,6 @@ TOOLS-$(CONFIG_ZLIB) += cws2fws
 BASENAMES   = ffmpeg ffplay ffprobe ffserver
 ALLPROGS    = $(BASENAMES:%=%$(PROGSSUF)$(EXESUF))
 ALLPROGS_G  = $(BASENAMES:%=%$(PROGSSUF)_g$(EXESUF))
-ALLMANPAGES = $(BASENAMES:%=%.1)
 
 FFLIBS-$(CONFIG_AVDEVICE) += avdevice
 FFLIBS-$(CONFIG_AVFILTER) += avfilter

doc/Makefile

@@ -99,7 +99,7 @@ endif
 uninstall: uninstall-man
 
 uninstall-man:
-	$(RM) $(addprefix "$(MANDIR)/man1/",$(ALLMANPAGES))
+	$(RM) $(addprefix "$(MANDIR)/man1/",$(MANPAGES))
 
 clean:: docclean