plscheme - plscheme: Fixed empty argument list handling and garbage

Log Message:
-----------
Fixed empty argument list handling and garbage collection bug for soft-port
redirections. (Thanks Andreas Seltenreich for spotting the bug.)

Previously, we were protecting created soft-port from Guile GC and releasing it
just before exit or in case of a failure by first unprotecting it and then
calling GC one last time. Actually, as long as there does exist a reference to
an object, GC would't touch it. But we were guaranteeing our object's existence.
I took this convention out and cleared unprotecting an already referenced object
stuff.

Modified Files:
--------------
plscheme:
plscheme-8.1.c (r1.1.1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plscheme/plscheme/plscheme-8.1.c.diff?r1=1.1.1.1&r2=1.2)
plscheme-8.2.c (r1.1.1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plscheme/plscheme/plscheme-8.2.c.diff?r1=1.1.1.1&r2=1.2)