visibility compile flag

[Àlex Fiestas]

Hi there

I'm porting libkscreen to Frameworks and I found that we are passing (when 
available) -fvisibility=hidden.

After reading this[1] really quick I thought I would send an email here so 
people wiser than me can decide if it makes sense to enable it to all 
frameworks by default, it sounds useful.

[1]: http://gcc.gnu.org/wiki/Visibility

Cheers!
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