build: split CPPFLAGS from CFLAGS

Automake provides a separate variable for preprocessor flags
(*_CPPFLAGS). They are already uses in a few places, so make it
consistent and use it everywhere. Note that cflags obtained from
pkg-config often are cppflags, which is why LIBXML2_CFLAGS moves with
into AM_CPPFLAGS, for example.

Change-Id: I15feed1d18b2ca497371271c4b5876d5ec6289dd
BUG: 862082
Original-author: Jan Engelhardt <jengelh@inai.de>
Signed-off-by: Jan Engelhardt <jengelh@inai.de>
Signed-off-by: Jeff Darcy <jdarcy@redhat.com>
Reviewed-on: http://review.gluster.org/4029
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>

0 files changed, 0 insertions, 0 deletions