Canonicalise CT_BUILD and CT_HOST:

- Not only will it give us full-qualified tuples, but it will also ensure
that they are valid tuples (in case of typo with user-provided tuples)
That's way better than trying to rewrite config.sub ourselves...
- use CT_BUILD_PREFIX and CT_BUILD_SUFFIX to call "gcc -dumpmachine"

/trunk/scripts/crosstool.sh | 29 7 22 0 +++++++----------------------
1 file changed, 7 insertions(+), 22 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/