Backport #878 from trunk:
Fix building x86_64 on x86_64 (and hopefully all other *64 archs on the same *64).

/branches/1.2/scripts/build/cc_gcc.sh | 26 0 26 0 --------------------------
/branches/1.2/scripts/crosstool.sh | 14 14 0 0 ++++++++++++++
2 files changed, 14 insertions(+), 26 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/