libc/eglibc: Make eglibc 2.11 and 2.12 not experimental

I haven't noticed the usual experimental testers complain about eglibc
2.11 or 2.12 being unstable. So stop marking them as experimental.

Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>

reporter_name="Alexander BIGGA"

reporter_url="http://sourceware.org/ml/crossgcc/2008-07/msg00000.html"

reporter_comment=""