#21 Enable static library build by CMake

[Pawel Stankowski]

I wanted to share changes I have introduced when I needed static version of QuaZip library generated by CMake.

BTW: I also added standard 'd' suffix for debug version of both libraries by adding "DEBUG_POSTFIX d" property to both targets.

[Pawel Stankowski]

I've recreated patch as the previous one was for 0.6.2 code. It also had a bug - "QUAZIP_STATIC" definition was not used during compilation.

New patch for trunk attached.

[Sergey A. Tachenov]

Applied in r256. Had to merge with others patches manually too.