[MPlayer-dev-eng] Fix for vo_gl suboption parsing

[Reimar Döffinger]

Hi,

this improves the suboption parsing of vo_gl and adds a little help 
message (option descriptions differ intentionally, but tell me if you 
dislike that).
I will apply tomorrow or so if nobody disagrees.
Diego, is that manpage part ok?

Greetings,
Reimar Döffinger
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