iw: honor CPPFLAGS when compiling

Pass CPPFLAGS to the compiler as done with CFLAGS.

Change-Id: Ic91d26125e8314b32596e9fefa0dd9393cf0cda1
Signed-off-by: Paride Legovini <pl@ninthfloor.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
1 file changed