update-bundled_gems.rb: Fix typo and version comparison

tool/update-bundled_gems.rb

@@ -12,7 +12,7 @@ unless /^[^#]/ !~ (gem = $F[0])
   if $F[3]
     if $F[3].include?($F[1])
       $F[3][$F[1]] = gem.version.to_s
-    elsif $F[2] != gem.version and /\A\h+\z/ =~ $F[3]
+    elsif Gem::Version.new($F[1]) != gem.version and /\A\h+\z/ =~ $F[3]
       $F[3..-1] = []
     end
   end