[Bug 735878] filesrc: use glib APIs for file checking

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=735878
  GStreamer | gstreamer (core) | git

--- Comment #5 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2014-09-18 18:26:58 UTC ---
It seemed obvious to me and it's standard operating procedure for all fd/file
related things to prefer using the already-open descriptor.

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