#415 WIN32: MSVC: fix build of libzmbv

[Carlo Bramini]

MSVC is unable to build libzmbv.
It happens that:

• It cannot use a macro like TDEFL_READ_UNALIGNED_WORD().
• unistd.h is unavailable.
  Attached patch fixes the issue.

[gpz]

this fix should also go upstream (we don't modify files in src/lib/)

[gpz]

upstream is here: https://github.com/mrdudz/libzmbv

[gpz]

r45876 contains all your libzmbv fixes. please test if they work for you like this

[Carlo Bramini]

Thank you, I'm also going to share my changes to upstream.
EDIT: It looks like somebody did it already, thanks!