[REVIEW 3-5][REVIEW 3-5-5] Fix fdo#48602: code-page mismatch in Visio 2000 files

[Fridrich Strba]

Dearest co-contributors,

Could you review and cherry-pick for me:

http://cgit.freedesktop.org/libreoffice/core/commit/?id=8c2843d807c15452a5b03ec8287d4f1c1ed35b01

It is a new version of libvisio that consolidates the patched in
libvisio modules fixing various crashes. It also implements the
conversion of different 8-bit MS code-pages to UCS4 and thus fixes the
code-page mismatch from fdo#48602.

This release also incorporates some innocent cppcheck fixes from Julien.

Cheers

F.