ia64: fix sn to add include files using EXTRA_CFLAGS

Changing the global CPPFLAGS is not the recommended way
to add additional include dirs.
Changed to use EXTRA_CFLAGS.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Jes Sorensen <jes@sgi.com>
4 files changed