[Autotools] Cleanup compiler flags
[Autotools] Cleanup compiler flags

Use AM_CFLAGS for media-service-upnp

Remove media_service_upnp_CPPFLAGS. Useless with AM_CFLAGS and
buggy as we are compiling in C, so we should have use _CFLAGS
instead.

Fix dms-info compiler flags. Use dms_info_CFLAGS instead of
dms_info_CPPFLAGS.

Signed-off-by: Ludovic Ferrandis <22de32f469b6975001fde4e8fec94685fb50d109@intel.com>

cguiraud/media-service-upnp,markdryan/media-service-upnp,cguiraud/media-service-upnp,markdryan/media-service-upnp,markdryan/media-service-upnp,cguiraud/media-service-upnp