For glibc & eglibc, try to auto-select the ports addon for those
architectures that require it (curently, ARM and MIPS are known to).

-------- diffstat follows --------
/trunk/config/libc/glibc-eglibc.in-common | 9 8 1 0 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

 # Compute powerpc-specific values

 . "${CT_LIB_DIR}/scripts/build/arch/powerpc-powerpc64.sh-common"