Add custom step for Windows for git-version.c.
Add git-version.c generation to CMake.
Fix iOS / debug ARM build.
Force libc++ on Mac, needed for Xcode 4.6 at least.
Fix small warning.
Add git-version.c generation for Qt.
And the Android cmake file as well.
Actually use the git version.

Also switch to cpp, duh.
Note the PPSSPP version in the log.

Fixes #807.
Merge pull request #839 from unknownbrackets/version

Show the git version in the log + other places