Enhance ./configure tools checking.
Add check for compatible autoconf.

/trunk/configure | 95 61 34 0 ++++++++++++++++++++++++++++++++++++++++----------------------
1 file changed, 61 insertions(+), 34 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/