[Bug 791616] gst-uninstalled.py: Don't close parent file descriptors

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791616

--- Comment #3 from Alicia Boya García <aboya at igalia.com> ---
When gst-uninstalled is used as a wrapper for an executable that relies on file
descriptor inheritance.

For instance, before calling fork(), WebKit creates a socket which shares to
its WebProcess children as an open file descriptor. The socket is not closed in
the child process before calling execv(), so they can still use it to
communicate with the browser.

Therefore, if the WebProcess is swapped by a wrapper, e.g. gst-uninstall, it's
necessary that such wrapper also does not close the socket file descriptor
before calling execv() to execute the actual WebProcess.

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