[CM] cload rebuilds don't consider *load-path*

[bil at ccrma.Stanford.EDU]

Thanks for the bug report.  I think port-filename can
include the load-path, but I'll need to look at the code
more.  Then realpath could give the full filename, if
it is needed.  I can't remember if you can get the full
filename from the FILE* pointer (this would be the best
option because the port struct contains that pointer).