[PATCH] restore arch/ppc/boot cflags

[Milton Miller]

Commit 9a39e273d4df0560c724c5fe71f6314a0583ca2b removed the boot directory
addition to CFLAGS that was being used by the subdirectory builds.  For the
other files, that patch set EXTRA_CFLAGS, but Makefile.build explicitly
sets that to empty as it is explicitly for a single directory only.
Append to KBUILD_CFLAGS instead.

Signed-off-by: Milton Miller <miltonm@xxxxxxx>
---
The commit also changed xtensia to export EXTRA_CFLAGS from its boot
directory, that needs to be fixed too.

from ARCH=ppc prep_defconfig:

/data/home/miltonm/work.git/arch/ppc/boot/of1275/write.c:11:20: error: of1275.h: No such file or directory
/data/home/miltonm/work.git/arch/ppc/boot/of1275/read.c:11:20:/data/home/miltonm/work.git/arch/ppc/boot/of1275/ofstdio.c:11:20:  error: error: of1275.h: No such file or directoryof1275.h: No such file or directory
/data/home/miltonm/work.git/arch/ppc/boot/of1275/release.c:11:20: error: of1275.h: No such file or directory
/data/home/miltonm/work.git/arch/ppc/boot/of1275/ofinit.c:11:20: error: of1275.h: No such file or directory
/data/home/miltonm/work.git/arch/ppc/boot/of1275/map.c:12:22: error: nonstdio.h: No such file or directory
/data/home/miltonm/work.git/arch/ppc/boot/of1275/map.c:11:20: error: of1275.h: No such file or directory
/data/home/miltonm/work.git/arch/ppc/boot/of1275/getprop.c:11:20: error: of1275.h: No such file or directory
/data/home/miltonm/work.git/arch/ppc/boot/common/ns16550.c:14:20: error: serial.h: No such file or directory
/data/home/miltonm/work.git/arch/ppc/boot/common/ns16550.c:13:22: error: nonstdio.h: No such file or directory
/data/home/miltonm/work.git/arch/ppc/boot/of1275/enter.c:11:20: error: of1275.h: No such file or directory
error: of1275.h: No such file or directory
/data/home/miltonm/work.git/arch/ppc/boot/of1275/claim.c:12:22: error: nonstdio.h: No such file or directory
/data/home/miltonm/work.git/arch/ppc/boot/of1275/claim.c:11:20: error: of1275.h: No such file or directory
/data/home/miltonm/work.git/arch/ppc/boot/of1275/finddevice.c:11:20: error: of1275.h: No such file or directory
/data/home/miltonm/work.git/arch/ppc/boot/common/bootinfo.c:14:22: error: nonstdio.h: No such file or directory
/data/home/miltonm/work.git/arch/ppc/boot/common/misc-common.c:18:22: error: nonstdio.h: No such file or directory
of1275.h: No such file or directory


diff --git a/arch/ppc/boot/Makefile b/arch/ppc/boot/Makefile
index 487dc66..52a0d38 100644
--- a/arch/ppc/boot/Makefile
+++ b/arch/ppc/boot/Makefile
@@ -13,6 +13,7 @@
 # modified by Cort (cort@xxxxxxxxxx)
 #
 
+KBUILD_CFLAGS 	+= -fno-builtin -D__BOOTER__ -Iarch/$(ARCH)/boot/include
 HOSTCFLAGS	+= -Iarch/$(ARCH)/boot/include
 
 BOOT_TARGETS	= zImage zImage.initrd znetboot znetboot.initrd
-
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