EGLIBC and PowerPCSPE port

This has been roughly one year since Debian switched from GLIBC to EGLIBC, so it's probably the time to make a small report about this change.

First of all, on the GLIBC upstream side, things has improved a bit since we now have regular stable release, thanks to Petr Baudis aka Pasky. The good point is that the stable releases are imported into the EGLIBC stable repositories.

On the EGLIBC side the switch has helped to reduce the number of patches in the Debian package (for example, resolv.conf is automatically reloaded if needed), and has brought some bug fixes and improvements, especially for the arm, mips and powerpc targets.

It should be noted that the newly created PowerPCSPE port for PowerPC e500 series CPU also benefits from EGLIBC, as it is not natively supported by GLIBC.