Search for old style dictionaries in DICPATH

When searching in system directories for old style dictionaries, also
look in the DICPATH environment variable much like the Hunspell
application does. This gives a lot more flexibility for users and
packagers in finding dictionaries at runtime.

The patch is simple, it just moves a block of code from
GetOldStyleDics that handles searching a directory to a new function,
GetOldStyleDicsInDir. Then if DICPATH is set, its directories are
passed to the new function. Original system directories are also
passed so dictionaries in system-wide directories are found.

Change-Id: I56ac66539495f03f41376b533ca19c6c8d615ec3
Reviewed-on: https://gerrit.libreoffice.org/29543
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: jan iversen <jani@documentfoundation.org>

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