GHOST*Cocoa.mm & .h files creation
First Cocoa version of GHOST_SystemCocoa.mm
CMake files update to allow optional (WITH_COCOA option) Cocoa version build - disabled by default
SCons files are not updated to allow Cocoa build (the ghost .mm files)
- CMake, use FIND_PACKAGE(Freetype) for unix/linux
- Only link with libdl.so on linux
- use statvfs rather then statfs for netbsd (size of statfs wasnt available)
- add x11 include path with ghost, glu.