configure: use standard check for attribure alias
authorEmil Velikov <emil.velikov@collabora.com>
Mon, 5 Dec 2016 19:52:40 +0000 (19:52 +0000)
committerEmil Velikov <emil.l.velikov@gmail.com>
Wed, 18 Jan 2017 16:01:14 +0000 (16:01 +0000)
commit95d9eae42745d958d94445dbfb343dd1927ba9d6
treed08f2454bb6a5b7361cb4724eeda59ec3e07f9b0
parentf121ac68b0b4e3b132201ec5fe13822d5a8cc162
configure: use standard check for attribure alias

Currently we have two macros - HAVE_ALIAS and GLX_ALIAS_UNSUPPORTED.
To make it even better former of which is explicitly cleared in some
cases while not in others.

Clear all that up by using a single macro properly set during configure.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
configure.ac