Makefile: remove quick2vo target for better 8.8 compatibility

awk.Makefile

@@ -19,17 +19,5 @@
 	next
 }
 
-# Add new target quick2vo to (a) run "make quick" with the same number of jobs, ensuring
-# that the .vio files are up-to-date, and (b) only schedule vio2vo for those
-# files where the .vo is *older* than the .vio.
-/^vio2vo:/ {
-	print "quick2vo:";
-	print "\t@make -j $(J) quick"
-	print "\t@VIOFILES=$$(for vofile in $(VOFILES); do viofile=\"$$(echo \"$$vofile\" | sed \"s/\\.vo/.vio/\")\"; if [ \"$$vofile\" -ot \"$$viofile\" -o ! -e \"$$vofile\" ]; then echo -n \"$$viofile \"; fi; done); \\"
-	print "\t echo \"VIO2VO: $$VIOFILES\"; \\"
-	print "\t if [ -n \"$$VIOFILES\" ]; then $(TIMER) $(COQC) $(COQDEBUG) $(COQFLAGS) -schedule-vio2vo $(J) $$VIOFILES; fi"
-	print ".PHONY: quick2vo"
-}
-
 # This forwards all unchanged lines
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