[Mesa-stable] libatomic fixes for 18.1 stable

[Dylan Baker]

Quoting Matt Turner (2018-06-13 10:18:24)
> Hi Dylan,
> 
> In the continuing struggle to use 64-bit atomics, please cherry-pick the
> following patches to the 18.1 stable branch:
> 
> 54ba73ef102f7b9085922686bb31719539e0dc3c (configure.ac/meson.build: Fix -latomic test)
> 54bbe600ec2654bcf43c3378e84d972e0a7ce4b6 (configure.ac: rework -latomic check)
> b29b5a82a17e845e73ebef845176d9d1f44a2d00 (meson: Fix -latomic check)
> 9d547a7617fbcbc29f75ed85ff774807ddca5ce0 (meson: Test for __atomic_add_fetch in atomic checks)
> baf16b2ea3a72d01712d4e16fae97606ac68dff0 (configure.ac: Test for __atomic_add_fetch in atomic checks)
> 
> I hope I never have to see this code again.
> 
> Thanks,
> Matt

All patches have been applied. Thanks for taking care of all of that.

Dylan
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