* add early exits as needed to prevent script from continuing in an error condiition
* clean up exit codes for mxe git to match rest of file
* clean up voxelands git checkout (this simplifies the commands)
* use gcc from mxe rather than from system path (affects windres) -- it will call the syste version of gcc and will fail to build because it might not produce 32bit code
* use cmake from mxe rather than from system path
* silence a warning that symlinks already exist
* silence a warning that CMakeCache.txt cannot be deleted because it does not exist
* delete other symlinks in mxe/usr/bin to cleanup
neoh4x0r
darkrose