Make autogen executable in linux

Signed-off-by: Matthew Khouzam <matthew.khouzam@gmail.com>
make cfilesystem and oggreader cross platform

code uplifted from scp 3.7.1

Signed-off-by: Matthew Khouzam <matthew.khouzam@gmail.com>
Make mission multi-platform...

needs fixing

Signed-off-by: Matthew Khouzam <matthew.khouzam@gmail.com>
fix capitalization in fulcrum.cpp

Signed-off-by: Matthew Khouzam <matthew.khouzam@gmail.com>