Upgrade to Autoconf 2.63

This upgrades the configure infrastructure to the latest Autoconf version.
Some notable news are:
 - The workaround for the broken fseeko() test is gone.
 - Checking for unknown options is now provided by Autoconf itself.
 - Fixes for Mac OS X

Author: petere

config/c-library.m4

@@ -1,5 +1,5 @@
 # Macros that test various C library quirks
-# $PostgreSQL: pgsql/config/c-library.m4,v 1.33 2008/08/21 13:53:28 petere Exp $
+# $PostgreSQL: pgsql/config/c-library.m4,v 1.34 2009/07/02 18:55:40 petere Exp $
 
 
 # PGAC_VAR_INT_TIMEZONE
@@ -297,29 +297,3 @@ int main()
 ])dnl AC_CACHE_VAL
 AC_MSG_RESULT([$pgac_cv_printf_arg_control])
 ])# PGAC_FUNC_PRINTF_ARG_CONTROL
-
-
-# backport from Autoconf 2.61a
-# http://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=f0c325537a22105536ac8c4e88656e50f9946486
-
-# AC_FUNC_FSEEKO
-# --------------
-AN_FUNCTION([ftello], [AC_FUNC_FSEEKO])
-AN_FUNCTION([fseeko], [AC_FUNC_FSEEKO])
-AC_DEFUN([AC_FUNC_FSEEKO],
-[_AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE, 1,
-   [ac_cv_sys_largefile_source],
-   [Define to 1 to make fseeko visible on some hosts (e.g. glibc 2.2).],
-   [[#include <sys/types.h> /* for off_t */
-     #include <stdio.h>]],
-   [[int (*fp) (FILE *, off_t, int) = fseeko;
-     return fseeko (stdin, 0, 0) && fp (stdin, 0, 0);]])
-
-# We used to try defining _XOPEN_SOURCE=500 too, to work around a bug
-# in glibc 2.1.3, but that breaks too many other things.
-# If you want fseeko and ftello with glibc, upgrade to a fixed glibc.
-if test $ac_cv_sys_largefile_source != unknown; then
-  AC_DEFINE(HAVE_FSEEKO, 1,
-    [Define to 1 if fseeko (and presumably ftello) exists and is declared.])
-fi
-])# AC_FUNC_FSEEKO

config/general.m4

@@ -1,4 +1,4 @@
-# $PostgreSQL: pgsql/config/general.m4,v 1.10 2008/10/29 09:27:24 petere Exp $
+# $PostgreSQL: pgsql/config/general.m4,v 1.11 2009/07/02 18:55:40 petere Exp $
 
 # This file defines new macros to process configure command line
 # arguments, to replace the brain-dead AC_ARG_WITH and AC_ARG_ENABLE.
@@ -33,7 +33,6 @@ m4_define([pgac_arg_to_variable],
 
 AC_DEFUN([PGAC_ARG],
 [
-pgac_args="$pgac_args pgac_arg_to_variable([$1],[$2])"
 m4_case([$1],
 
 enable, [
@@ -74,22 +73,6 @@ AC_ARG_WITH([$2], [AS_HELP_STRING([--]m4_if($3, -, without, with)[-$2]m4_if($3,
 )
 ])# PGAC_ARG
 
-# PGAC_ARG_CHECK()
-# ----------------
-# Checks if the user passed any --with/without/enable/disable
-# arguments that were not defined. Just prints out a warning message,
-# so this should be called near the end, so the user will see it.
-
-AC_DEFUN([PGAC_ARG_CHECK],
-[for pgac_var in `set | sed 's/=.*//' | $EGREP 'with_|enable_'`; do
-  for pgac_arg in $pgac_args with_gnu_ld; do
-    if test "$pgac_var" = "$pgac_arg"; then
-      continue 2
-    fi
-  done
-  pgac_txt=`echo $pgac_var | sed 's/_/-/g'`
-  AC_MSG_WARN([option ignored: --$pgac_txt])
-done])# PGAC_ARG_CHECK
 
 # PGAC_ARG_BOOL(TYPE, NAME, DEFAULT, HELP-STRING-RHS,
 #               [ACTION-IF-YES], [ACTION-IF-NO])