memory: fix memory alignment
memory: fix memory alignment

Fix compilation when POSIX_MEMALIGN is not set.
Debug the configured alignment.

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=660300

shelsonjava/gstreamer,lovebug356/gstreamer,krichter722/gstreamer,krieger-od/gstreamer,shelsonjava/gstreamer,krichter722/gstreamer,centricular/gstreamer,lovebug356/gstreamer,cfoch/gstreamer,surround-io/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,lubosz/gstreamer,Lachann/gstreamer,lovebug356/gstreamer,surround-io/gstreamer,shelsonjava/gstreamer,collects/gstreamer,krieger-od/gstreamer,krieger-od/gstreamer,collects/gstreamer,collects/gstreamer,jpakkane/gstreamer,lovebug356/gstreamer,mparis/gstreamer,StreamUtils/gstreamer,shelsonjava/gstreamer,krieger-od/gstreamer,cfoch/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,cablelabs/gstreamer,ensonic/gstreamer,mparis/gstreamer,jpakkane/gstreamer,mparis/gstreamer,jpxiong/gstreamer,ensonic/gstreamer,centricular/gstreamer,shelsonjava/gstreamer,justinjoy/gstreamer,jpxiong/gstreamer,lovebug356/gstreamer,mparis/gstreamer,cablelabs/gstreamer,jpakkane/gstreamer,jpxiong/gstreamer,ensonic/gstreamer,mparis/gstreamer,jpakkane/gstreamer,cablelabs/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,collects/gstreamer,surround-io/gstreamer,krieger-od/gstreamer,justinjoy/gstreamer,centricular/gstreamer,Lachann/gstreamer,justinjoy/gstreamer,krichter722/gstreamer,cablelabs/gstreamer,lubosz/gstreamer,centricular/gstreamer,ensonic/gstreamer,lubosz/gstreamer,Lachann/gstreamer,justinjoy/gstreamer,lubosz/gstreamer,Lachann/gstreamer,cfoch/gstreamer,cablelabs/gstreamer,justinjoy/gstreamer,jpxiong/gstreamer,jpakkane/gstreamer,lubosz/gstreamer,collects/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,Lachann/gstreamer,cfoch/gstreamer,surround-io/gstreamer,surround-io/gstreamer,cfoch/gstreamer,ensonic/gstreamer