configure: make the C11 atomics check more robust
authorMichael Niedermayer <michael@niedermayer.cc>
Fri, 13 Apr 2018 14:04:40 +0000 (11:04 -0300)
committerJames Almer <jamrial@gmail.com>
Fri, 13 Apr 2018 14:08:17 +0000 (11:08 -0300)
commit876f9ac9a682fc2a3b05d2fe35354d717ae39dc3
tree908e99d3b09dc6812f48d168c6e5bb75b974c321
parente7a2f1f8d8350a768ca88b61303449433962b52d
configure: make the C11 atomics check more robust

C11 atomics allow direct access. This check should prevent the usage
of bogus stdatomic.h available on some systems.

Signed-off-by: James Almer <jamrial@gmail.com>
configure