sh: Make O= builds work again.

Some of the paths were a bit broken, fix it up.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/Makefile

@@ -135,17 +135,14 @@ boot := arch/sh/boot
 
 CPPFLAGS_vmlinux.lds := -traditional
 
-ifneq ($(KBUILD_SRC),)
 incdir-prefix	:= $(srctree)/include/asm-sh/
-else
-incdir-prefix	:=
-endif
 
 #	Update machine arch and proc symlinks if something which affects
 #	them changed.  We use .arch and .mach to indicate when they were
 #	updated last, otherwise make uses the target directory mtime.
 
-include/asm-sh/.cpu: $(wildcard include/config/cpu/*.h) include/config/auto.conf
+include/asm-sh/.cpu: $(wildcard include/config/cpu/*.h) \
+		     include/config/auto.conf FORCE
 	@echo '  SYMLINK include/asm-sh/cpu -> include/asm-sh/$(cpuincdir-y)'
 	$(Q)if [ ! -d include/asm-sh ]; then mkdir -p include/asm-sh; fi
 	$(Q)ln -fsn $(incdir-prefix)$(cpuincdir-y) include/asm-sh/cpu
@@ -155,7 +152,8 @@ include/asm-sh/.cpu: $(wildcard include/config/cpu/*.h) include/config/auto.conf
 #	don't, just reference the parent directory so the semantics are
 #	kept roughly the same.
 
-include/asm-sh/.mach: $(wildcard include/config/sh/*.h) include/config/auto.conf
+include/asm-sh/.mach: $(wildcard include/config/sh/*.h) \
+		      include/config/auto.conf FORCE
 	@echo -n '  SYMLINK include/asm-sh/mach -> '
 	$(Q)if [ ! -d include/asm-sh ]; then mkdir -p include/asm-sh; fi
 	$(Q)if [ -d $(incdir-prefix)$(incdir-y) ]; then \
@@ -168,7 +166,7 @@ include/asm-sh/.mach: $(wildcard include/config/sh/*.h) include/config/auto.conf
 	fi
 	@touch $@
 
-archprepare: maketools include/asm-sh/.cpu include/asm-sh/.mach
+archprepare: include/asm-sh/.cpu include/asm-sh/.mach maketools
 
 PHONY += maketools FORCE
 maketools:  include/linux/version.h FORCE