fix external module compile

[Andrea Arcangeli <andrea@qumranet.com>]

Hello,

after updating kvm-userland.git, kvm.git and linux-2.6-hg, and after
make distclean and rebuild with slightly reduced .config, I can't
compile the external module anymore. Looking into it with V=1, $(src)
defines to "" and including /external-module-compat.h clearly fails. I
fixed it like below, because it seems more consistent to enforce the
ordering of the "special" includes in the same place, notably
$(src)/include is already included as $LINUX at point 1 of the
comment, so this looks a cleanup of superflous line in Kconfig besides
fixing my compile by moving the external-module-compat in the same
place with the other includes where `pwd` works instead of $(src) that
doesn't work anymore for whatever reason.

Signed-off-by: Andrea Arcangeli <andrea@qumranet.com>

diff --git a/kernel/Kbuild b/kernel/Kbuild
index cabfc75..d9245eb 100644
--- a/kernel/Kbuild
+++ b/kernel/Kbuild
@@ -1,4 +1,3 @@
-EXTRA_CFLAGS := -I$(src)/include -include $(src)/external-module-compat.h
 obj-m := kvm.o kvm-intel.o kvm-amd.o
 kvm-objs := kvm_main.o x86.o mmu.o x86_emulate.o anon_inodes.o irq.o i8259.o \
 	 lapic.o ioapic.o preempt.o i8254.o external-module-compat.o
diff --git a/kernel/Makefile b/kernel/Makefile
index 78ff923..e3fccbe 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -27,7 +27,8 @@ all::
 #	include header priority 1) $LINUX 2) $KERNELDIR 3) include-compat
 	$(MAKE) -C $(KERNELDIR) M=`pwd` \
 		LINUXINCLUDE="-I`pwd`/include -Iinclude -I`pwd`/include-compat \
-		-include include/linux/autoconf.h" \
+		-include include/linux/autoconf.h \
+		-include `pwd`/external-module-compat.h"
 		"$$@"
 
 sync: header-sync source-sync

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