[RFC] cleanup cairo detection

[Riccardo Magliocchetti]

Hello,

finally managed to get back to libo after a few and found that cairo is 
needed even with --disable-cairo-canvas.

The situation is a bit more convoluted than last time so while at move 
all the cairo related machinery in the same place and try to make easier 
to follow the various cases.

I won't have a full build before monday (update: it failed, looks 
unrelated) so any review / test in the mean time is appreciated.

Will post a proper patch from git after i get the build sorted out.

thanks,
riccardo
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