Backport #1249 from trunk:
- Canonicalise CT_BUILD and CT_HOST

/branches/1.3/scripts/crosstool.sh | 29 7 22 0 +++++++----------------------
1 file changed, 7 insertions(+), 22 deletions(-)

# x86 specific options

config ARCH_x86

    select ARCH_SUPPORT_ARCH

    select ARCH_SUPPORT_CPU

    select ARCH_SUPPORT_TUNE

    help

      The x86 architecture, as defined by:

        http://www.intel.com/