shared: Print .c file/line number in x* routines

Switches from inline to pre-processor definitions in order to utilize
__FILE__ and __LINE__ from the .c file in order to display the location
of memory allocation failures when failing.

Now xmalloc, et al calls will produce:

    [weston-info] clients/weston-info.c:714: out of memory (1024)

Signed-off-by: Bryce Harrington <bryce@osg.samsung.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
1 file changed