Autoconf 2.54 patch for the Hurd

[Jeff Bailey]

I've back to hacking on the Hurd build stuff.  Automake 1.7.1 requires
Autoconf 2.54.  Also, this allows the same autoconf to work on both
glibc and hurd.

This is my bare-minimum patch for upgrading.  I will follow with more
patches to remove obsolete macros after this one is applied.

2002-10-23  Jeff Bailey  <jbailey@gnu.org>

        * configure.in: Update for Autoconf 2.54
          - Use new syntax for AC_INIT, AC_CONFIG_SRCDIR
          - Replace AC_FD_CC with AS_MESSAGE_LOG_FD
          - Use new syntax for AC_CONFIG_FILES, AC_OUTPUT
          - Replace AC_CHECK_TOOL, hurd_PROG_CC with AC_PROG_CC
            This provides all the functionality we want.

        * aclocal.m4: Update for Autoconf 2.54
          - Remove definitions for hurd_PROG_CC, hurd_PROG_CC_WORKS.
          - Replace AC_FD_CC with AS_MESSAGE_LOG_FD

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