[Bug 679112] controller: fix GStreamer build on Visual C++ by adding isnan() to math-compat.h

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=679112
  GStreamer | gstreamer (core) | git

Tim-Philipp Müller <t.i.m> changed:

           What    |Removed                     |Added
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 Attachment #217592|none                        |committed
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