[cairo] cairo release 1.10.0, upgrade

[Bill Spitzak]

Alexander Shulgin wrote:

> 4. ./configure --prefix=$HOME
> 
> Note that installing to the default /usr/local may break your system,
> hence the --prefix.

This will not work unless you also set a couple other environment 
variables, due to pkgconfig ignoring --prefix. Sorry I forget what they 
are right now but it has been mentioned several times on this mailing list.

Apparently fixing this bug has been discussed and dismissed as being 
incompatible with programs relying on the current pkgconfig behavior. 
However this really needs to be clearly documented in the README as 
several people attempting to compile cairo have been bitten by it.