Force getting glibc>=2.8 via checkout if any addon is selected.

-------- diffstat follows --------
/trunk/config/libc/glibc.in | 7 7 0 0 +++++++
/trunk/config/libc/glibc-eglibc.in-common | 6 6 0 0 ++++++
2 files changed, 13 insertions(+)

 # powerpc specific configuration file

 config ARCH_powerpc

     select ARCH_SUPPORT_ABI

     select ARCH_SUPPORT_CPU

     select ARCH_SUPPORT_TUNE

     help

       The PowerPC architecture, as defined by:

         http://www.ibm.com/developerworks/eserver/articles/archguide.html