Chomp last punctuations from descriptions for `-h`

The following parts will not be shown for `-h` option.  And not to
reach 80 columns.  Some terminal emulators (Windows command prompt at
least) wrap the cursor to the next line when reaching the rightmost
column, before exceeding.

ruby.c

@@ -254,6 +254,7 @@ show_usage_part(const char *str, const unsigned int namelen,
     const char *sb = highlight ? esc_bold : esc_none;
     const char *se = highlight ? esc_reset : esc_none;
     unsigned int desclen = (unsigned int)strcspn(desc, "\n");
+    if (!help && desclen > 0 && strchr(".;:", desc[desclen-1])) --desclen;
     if (help && (namelen + 1 > w) && /* a padding space */
         (int)(namelen + secondlen + indent_width) >= columns) {
         printf(USAGE_INDENT "%s" "%.*s" "%s\n", sb, namelen, str, se);

test/ruby/test_rubyoptions.rb

@@ -46,7 +46,7 @@ class TestRubyOptions < Test::Unit::TestCase
   def test_usage
     assert_in_out_err(%w(-h)) do |r, e|
       assert_operator(r.size, :<=, 25)
-      longer = r[1..-1].select {|x| x.size > 80}
+      longer = r[1..-1].select {|x| x.size >= 80}
       assert_equal([], longer)
       assert_equal([], e)
     end