x86, boot: Explicitly include autoconf.h for hostprogs

The hostprogs need access to the CONFIG_* symbols found in
include/generated/autoconf.h.  But commit abbf159 ("UAPI: Partition
the header include path sets and add uapi/ header directories") replaced
$(LINUXINCLUDE) with $(USERINCLUDE) which doesn't contain the necessary
include paths.

This has the undesirable effect of breaking the EFI boot stub because
the #ifdef CONFIG_EFI_STUB code in arch/x86/boot/tools/build.c is
never compiled.

It should also be noted that because $(USERINCLUDE) isn't exported by
the top-level Makefile it's actually empty in arch/x86/boot/Makefile.

Cc: H. Peter Anvin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Acked-by: David Howells <[email protected]>
Signed-off-by: Matt Fleming <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: Matt Fleming

arch/x86/boot/Makefile

@@ -37,7 +37,8 @@ setup-y		+= video-bios.o
 targets		+= $(setup-y)
 hostprogs-y	:= mkcpustr tools/build
 
-HOST_EXTRACFLAGS += -I$(srctree)/tools/include $(USERINCLUDE) \
+HOST_EXTRACFLAGS += -I$(srctree)/tools/include \
+		    -include include/generated/autoconf.h \
 	            -D__EXPORTED_HEADERS__
 
 $(obj)/cpu.o: $(obj)/cpustr.h