This is closer to our packaging policies anyway. It also makes it easier to
install the 32-bit library on a 64-bit system, which may be needed for
Steam.

One can now also use "urpmi primus-lib32" to install the package with
the 32-bit libGL.so.1 from primus. This is easier to remember than the
real name of that package (chosen according to our policies),
libprimus_gl1.

Before this commit, primus always searched for its libGL.so.1 in
/usr/lib64/primus/ only. This is no good for the 32-bit apps on x86_64,
e.g., the games from Steam.

http://bugs.rosalinux.ru/show_bug.cgi?id=7488