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

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

 # ia64 specific config options

 config ARCH_ia64

     select ARCH_SUPPORTS_BOTH_ENDIAN

     help

       The ia64 architecture, as defined by:

         http://www.intel.com/design/itanium/arch_spec.htm