[Bug 774876] meson: add libm to has_function checks

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774876

--- Comment #5 from Nirbheek Chauhan <nirbheek.chauhan at gmail.com> ---
Adding -lm everywhere is not going to cause overlinking because Meson passes
--as-needed by default, so this is ok to go in. I will push it tomorrow if no
one else beats me to it. :)

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