* filesys.c (scm_readlink): Make local vars rv and size ints, to

* filesys.c (scm_readlink): Make local vars rv and size ints, to
avoid signed/unsigned comparison warnings, and because the return
value of readlink may be -1.  Don't bother casting the third
argument to readlink.
* filesys.c (scm_dirname, scm_basename): Move these to their own
page, at the end of the file.
* filesys.h (scm_dirname, scm_basename): Add prototypes for these.