[build] Fix up the etc/mono/config map for Cairo
[build] Fix up the etc/mono/config map for Cairo

It was mapping to libcairo.so.2, not libcairo.2.dylib

mono/bockbuild,bl8/bockbuild,mono/bockbuild,BansheeMediaPlayer/bockbuild,bl8/bockbuild,BansheeMediaPlayer/bockbuild,bl8/bockbuild,BansheeMediaPlayer/bockbuild