Revision 4063

Fix build errors on Windows (patches by Ross Maxx):

* src/Serialization.h: Fix 'ssize_t' on MSVC. MSVC compiler doesn't
  contain 'ssize_t' but it contains 'SSIZE_T'.

* CMake: Raise minimum requirement to C++11 as libgig code in general
  already depends on this C++ standard version.

* CMake: Fix installation rules for libakai.

* CMake: Raise minimum requirement to CMake 3.1.

* Bumped version (4.3.0.svn35).