remove gperf left-overs from build system

I removed all the gperf use, but not the Makefile rules.  Sam Ravnborg
says I get bonus points for cleaning this up.  I'll hold him to it.
Requested-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

scripts/Makefile.lib

@@ -194,15 +194,6 @@ endef
 
 ifdef REGENERATE_PARSERS
 
-# GPERF
-# ---------------------------------------------------------------------------
-quiet_cmd_gperf = GPERF $@
-      cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
-
-.PRECIOUS: $(src)/%.hash.c_shipped
-$(src)/%.hash.c_shipped: $(src)/%.gperf
-	$(call cmd,gperf)
-
 # LEX
 # ---------------------------------------------------------------------------
 LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)