[PATCH] kbuild: drop redundant "PHONY += FORCE"

[Michal Marek]

On Fri, Apr 08, 2016 at 11:16:10AM +0900, Masahiro Yamada wrote:
> "PHONY += FORCE" is already cared by scripts/Makefile.build,
> which these files are included from.

arch/ia64/Makefile is in fact included via the main Makefile. But this
one also has the PHONY += FORCE statement. Maybe we should initialize
PHONY with FORCE in Kbuild.include. Nevertheless, this patch is correct.

Michal