[m-rev.] diff: require at least autoconf 2.58

[Julien Fischer]

Note: most of our machines already had 2.59 installed.  I've installed
2.59 on the one machine (aral) that didn't.

Estimated hours taken: 0
Branches: main

configure.in:
 	Bump the version of autoconf that we require to 2.58 because
 	version 7 of the Boehm gc requires at least that.

Julien.

Index: configure.in
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/configure.in,v
retrieving revision 1.469
diff -u -r1.469 configure.in
--- configure.in	20 Aug 2006 05:44:02 -0000	1.469
+++ configure.in	22 Aug 2006 09:21:27 -0000
@@ -22,7 +22,8 @@

  # AC_CHECK_TYPES does not exist in versions of autoconf before 2.50.
  # AC_CHECK_TYPE is broken in versions of autoconf before 2.50.
-AC_PREREQ(2.50)
+# Version 7 of the Boehm gc requires at least version 2.58.
+AC_PREREQ(2.58)
  #-----------------------------------------------------------------------------#
  #
  # Ensure that all messages are saved to a file `configure.log' by

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