[bug-gv] Working around gs issues by changing to a safe working dir

[Bernhard R. Link]

Attached patch is not yet in upstreamable quality, but I thought I
better already post it here in case someone has comments or want
to improve it before I have the time.

The idea is to avoid any working directory problems by running gs
only in a safe working directory.

The patch is quite minimal and targeted at the Debian packages,
so still todo:

- modify Makefile.am instead of .in
- create the directory on install time
- port to non-glibc (currently uses canonicalize_file_name)
- documentation updates
- perhaps a command line argument.

        Bernhard R. Link

0006-start-gs-in-a-safe-working-directory.patch
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