[cairo] Compiling under Solaris failed with unrefrenced symbol

[M Joonas Pihlaja]

Hi Reinhard,

Could you check that your glib version is something relatively new?
The g_once_init* functions need at least >= 2.14.  Turns out cairo is
missing a minimum version check so we need to add that too once we
actually figure out what the minimum version should be. :)

Joonas