Completes adding long-options to chirp.
Avoid undefined symbol error when parrot is not enabled.
Fixes build error on Cygwin.
Quick fix to allow compile on Cywgin to complete.
Moved system-dependent uptime code into its own module,
with a warning emitted if we haven't implemented it for
that platform.  Fixes a build problem on Solaris.
Solaris: include <signal.h> is required.
Solaris: Does not have fts_open/read/close.