Fwd: [PATCH] Fix building on musl-libc

[Kylie McClain]

libdrm git master fails to compile due to undefined functions/constants
on musl libc. The attached patches fix it. (I've attached them rather than
included them in the message since gmail is really bad about ruining patch
formatting.)

I originally posted these to https://bugs.freedesktop.org/show_bug.cgi?id=93764
in a different form, and have modified them to Emil's comments on the
bugzilla entry.

commit 6ec5d220184e46135109923d252ae619068b7eb2
Author: Kylie McClain <somasis at exherbo.org>
Date:   Tue Jan 19 22:27:28 2016 -0500

    tests: Include poll.h rather than sys/poll.h

    sys/poll.h is a non-standard location of the poll.h header, and is
    incorrect on non-glibc libcs. poll.h, however, is defined in SUS (v2)
    and is more portable.

    http://pubs.opengroup.org/onlinepubs/007908799/xsh/poll.h.html

commit 6e7f12f1977bd13d10d99bc7826c54b692284c38
Author: Kylie McClain <somasis at exherbo.org>
Date:   Tue Jan 19 22:24:15 2016 -0500

    kms-steal-crtc: Make use of sys/select.h if available

    On systems using musl libc, FD_ZERO, FD_SET, select, etc. are defined
    in sys/select.h. This behavior is defined in IEEE Std 1003.1, 2000,
    http://pubs.opengroup.org/onlinepubs/009696899/basedefs/sys/select.h.html
    and fixes building kms-steal-crtc on musl libc systems.
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