tools build: Make fixdep a hostprog

It is used in the build process, so stop suppressing its build in tools
cross builds.

Signed-off-by: Jiri Olsa <[e-mail]>
Tested-by: Arnaldo Carvalho de Melo <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Madhavan Srinivasan <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Sukadev Bhattiprolu <[e-mail]>
Cc: [e-mail]
Link: http://lkml.kernel.org/r/20160927141846.GA6589@krava
[ Use HOSTCC on the $(OUTPUT)fixdep target, it was using the x-compiler
to link fixdep-in.o, that was correctly built with HOSTCC and thus failing ]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/build/Build

···
+hostprogs := fixdep
+
 fixdep-y := fixdep.o

tools/build/Makefile

···
 	$(Q)$(MAKE) $(build)=fixdep
 
 $(OUTPUT)fixdep: $(OUTPUT)fixdep-in.o
-	$(QUIET_LINK)$(CC) $(LDFLAGS) -o $@ $<
+	$(QUIET_LINK)$(HOSTCC) $(LDFLAGS) -o $@ $<
 
 FORCE:
 

tools/build/Makefile.include

···
 build := -f $(srctree)/tools/build/Makefile.build dir=. obj
 
-ifdef CROSS_COMPILE
-fixdep:
-else
 fixdep:
 	$(Q)$(MAKE) -C $(srctree)/tools/build CFLAGS= LDFLAGS= $(OUTPUT)fixdep
-endif
 
 .PHONY: fixdep