Enable ccl-proxy support if possible by default: yes, if nothing specified and scif...

Enable ccl-proxy support if possible by default: yes, if nothing specified and scif.h is present no, if scif.h is not present and nothing specfied no, if --enable-mcm=no is specified yes, if --enable-mcm=yes and scif.h is present error, if --enable-mcm=yes and scif.h missing

Make the corresponding changes to the spec file so that whatever
options are specified, the RPM will contain the right files (before
we were shipping the mpxyd service and conf regardless).