__init__.py: remove only_deps and make_def options.
__init__.py: remove only_deps and make_def options.

Remove the only_deps argument.  The original rational was that if you want to
create IDE project files with SCons, you would not want to build the Mex files
simultaneously (which might fail, so you would have neither).  This is much
better handled by other SCons features, e.g., Default().

Also remove the make_def argument, which has remained unused.

marcecj/scons_matlab