xorg-lib-common: fix malloc0returnsnull usage
Xorg libraries that use Xmalloc need to know if malloc(0) returns NULL or not,
and as this is a runtime test it can't be checked for. Previously
xorg-lib-common declared that malloc(0) did return NULL, but this isn't true for
eglibc (only uclibc).
Instead, use libc-specific overrides to pass the relevant option.
(ideally the check would use the autoconf cache so this can be stored in the site files)
(From OE-Core master rev:
e628c8aba0189de30de2833882b9999ff3b6547a)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
