[Bug 759089] Add a fallback that copies the commit hook in autogen.sh

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759089

--- Comment #1 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
Created attachment 316849
  --> https://bugzilla.gnome.org/attachment.cgi?id=316849&action=edit
Pre-commit: Fallback to copy when symlink does not work

On certain filesystems like FAT, NTFS and some network file systems,
symlinks are not supported. In those case, installing the pre-commit
hook fails and leave developpers with having to run the style checker
manually.

Instead, fallback to copy. This should enable the commit hook for
Windows developpers and users of filesystems that don't support symlinks.

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