perf build: Move feature checks code under tools/build

Moving feature checks code under tools/build directory.

Changing also $feature_dir to point to new feature directory location
and perf Makefiles to include Makefile.feature from new location.

Signed-off-by: Jiri Olsa <[e-mail]>
Cc: Corey Ashford <[e-mail]>
Cc: David Ahern <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: http://lkml.kernel.org/n/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/Makefile.perf

···
 #
 config-clean:
 	$(call QUIET_CLEAN, config)
-	$(Q)$(MAKE) -C config/feature-checks clean >/dev/null
+	$(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
 
 clean: $(LIBTRACEEVENT)-clean $(LIBAPI)-clean config-clean
 	$(call QUIET_CLEAN, core-objs)  $(RM) $(LIB_FILE) $(OUTPUT)perf-archive $(OUTPUT)perf-with-kcore $(LANG_BINDINGS)

tools/perf/config/Makefile

···
 
 EXTLIBS = -lpthread -lrt -lm -ldl
 
-include $(src-perf)/config/Makefile.feature
+include $(srctree)/tools/build/Makefile.feature
 
 ifeq ($(feature-stackprotector-all), 1)
   CFLAGS += -fstack-protector-all

tools/perf/config/Makefile.feature tools/build/Makefile.feature

···
-feature_dir := $(srctree)/tools/perf/config/feature-checks
+feature_dir := $(srctree)/tools/build/feature
 
 ifneq ($(OUTPUT),)
-  OUTPUT_FEATURES = $(OUTPUT)config/feature-checks/
+  OUTPUT_FEATURES = $(OUTPUT)feature/
   $(shell mkdir -p $(OUTPUT_FEATURES))
 endif