Fix installing uClibc headers for versions prior to 0.9.30.
Fix a comment about installing uClibc.
Automatically enable // build for uClibc versions that can be built in //.

-------- diffstat follows --------
/trunk/scripts/build/libc/uClibc.sh | 32 23 9 0 +++++++++++++++++++++++---------
/trunk/config/libc/uClibc.in | 12 7 5 0 +++++++-----
2 files changed, 30 insertions(+), 14 deletions(-)

# 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