rct2.c: port get_file_path.
rct2.c: port check_mutex().
rct2.c: port check_files_integrity().
Merge branch 'master' into get_file_path
rct2.c: make naming inside check_files_integrity consistent with get_file_path.
rct2.c: port check_file_paths and check_file_path.
Merge branch 'master' into get_file_path
Merge pull request #193 from DutchRPW/get_file_path

Port startup checks