[oe] Attempt to fix libatomic-ops

[heinold at inf.fu-berlin.de]

Hi,

this 3 patches switches libatomic-op to its own dir,
uses the cvs version and hopefully fixes the cairo
build in cases where gcc is to old. I did not find
the time to test the build with the older gcc. With
gcc-4.5 for arm and ppc arch the gcc mechanism for
atomic-op's are used.

Bye Henning