[PATCH] fix broken cross compiles

The change to kbuild to use -isystem `gcc -print-file-name=include`
broke our parisc crosscompile (and presumably everyone else's).

The reason is that you have a := in the NOSTDINC_FLAGS rule, which is
evaluated in situ (i.e.  before we've had a chance to set CROSSCOMPILE
on CC) so the gcc include path is actually the native one not the
crosscompiler one.  On parisc this causes us to be unable to handle
_builtin_va functions, but I bet there are a heap of other problems. 
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Makefile

@@ -331,7 +331,7 @@ KALLSYMS	= scripts/kallsyms
 PERL		= perl
 CHECK		= sparse
 
-NOSTDINC_FLAGS := -nostdinc -isystem $(shell $(CC) -print-file-name=include)
+NOSTDINC_FLAGS  = -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__
 CHECKFLAGS     += $(NOSTDINC_FLAGS)
 MODFLAGS	= -DMODULE