Fix building x86_64 on x86_64 (and hopefully all other *64 archs on the same *64):
- symlink all lib64/ dirs to the corresponding lib/ dir
Also, prevent gcc from installing some of its target libs outside of the sys-root, in the first place.
Thanks to Laurent DUFRECHOU for reporting the bug and testing the fix.

/trunk/scripts/build/cc_gcc.sh | 26 0 26 0 --------------------------
/trunk/scripts/crosstool.sh | 14 14 0 0 ++++++++++++++
2 files changed, 14 insertions(+), 26 deletions(-)

 # MIPS specific config options

 config ARCH_mips

     select ARCH_SUPPORTS_BOTH_ENDIAN

     select ARCH_DEFAULT_BE

     select ARCH_SUPPORT_ARCH

     select ARCH_SUPPORT_ABI

     select ARCH_SUPPORT_TUNE

     help

       The MIPS architecture, as defined by:

         http://www.mips.com/