Fix option handling.

Add debug option to getopt inputs.
Add debug option to usage output.
Add version option to usage output.

Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>

--- mirmon-2.11.orig/mirmon	2020-04-30 13:32:52.803951845 -0700
+++ mirmon-2.11/mirmon	2020-04-30 13:33:58.051641169 -0700
@@ -1900,12 +1900,14 @@
 Usage: $prog [-v] [-q] [-t timeout] [-c conf] [-get all|update|url <url>]
 option v   : be verbose
 option q   : be quiet
+option d   : debug output
 option t   : set timeout ; default $TIMEOUT
 option get : get all       : probe all sites
            : get update    : probe a selection of the sites (see doc)
            : get url <url> : probe some <url> (in the mirror-list).
 option c   : configuration file ; default search :
              ( $DEF_CNF )
+option version : display version
 -------------------------------------------------------------------
 Mirmon normally only reports errors and changes in the mirror list.
 This is $VERSION.
@@ -1924,7 +1926,7 @@
 use Getopt::Long ;
 Getopt::Long::config ( 'no_ignore_case' ) ;
 my %opt = () ;
-Usage '' unless GetOptions ( \%opt, qw(v q t=i get=s c=s version) ) ;
+Usage '' unless GetOptions ( \%opt, qw(d v q t=i get=s c=s version) ) ;
 Usage "Arg count\n" if @ARGV > 1 ;
 Usage "Arg count\n" if $opt{get} and $opt{get} eq 'url' and ! @ARGV ;