[Bug 667292] gstfilesrc: Check for posix_madvise(), and use it, as well as madvise()

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=667292
  GStreamer | gstreamer (core) | git

--- Comment #3 from Idar Tollefsen <itollefs at cisco.com> 2012-05-15 13:36:38 UTC ---
In all honesty, I simply observed that compilation failed because I didn't have
madvise() and went about finding a alternative. I don't think we even use file
source for anything but testing.

So in short, I have no preference one way or the other when it comes to
removing the madvise() calls.

If you want to keep them though, I'd prefer if configure could do at least some
basic checks. If the current ones are overkill, maybe a simpler AC_CHECK_FUNC
would suffice?

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