Remove manual check for Ogg::LibOgg

Removed the code which checks for Ogg::LibOgg, as this is listed in PREREQ_PM, installers such as cpan will install required prerequisites automatically.

https://rt.cpan.org/Public/Bug/Display.html?id=95160
Merge pull request #5 from MartinMcGrath/patch-1

Remove manual check for Ogg::LibOgg