[PATCH] Minor cross-compile issues

From: Pratik Solanki <pratik.solanki@timesys.com>

- Fix include path for build.c so that it finds asm/boot.h.
  /usr/include/asm/boot.h may not be present when cross-compiling on a
  non-Linux machine.

- $(CONFIG_SHELL) instead of sh.

arch/i386/boot/Makefile

@@ -31,6 +31,8 @@ subdir- 	:= compressed
 
 host-progs	:= tools/build
 
+HOSTCFLAGS_build.o := -Iinclude
+
 # ---------------------------------------------------------------------------
 
 $(obj)/zImage:  IMAGE_OFFSET := 0x1000

init/Makefile

@@ -23,4 +23,4 @@ $(obj)/version.o: include/linux/compile.h
 
 include/linux/compile.h: FORCE
 	@echo '  CHK     $@'
-	@sh $(srctree)/scripts/mkcompile_h $@ "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CC) $(CFLAGS)"
+	@$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@ "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CC) $(CFLAGS)"