[xml] Patch for configure.in

[Bjorn Reese <breese mail1 stofanet dk>]

Fixed typo in variable name.

*** configure.in.org    2007-04-28 17:04:32.000000000 +0200
--- configure.in        2007-04-28 17:05:13.000000000 +0200
***************
*** 170,176 ****
  if test "$with_schemas" = "yes"
  then
      with_pattern=yes
!     with_regexp=yes
  fi
  if test "$with_schematron" = "yes"
  then
--- 170,176 ----
  if test "$with_schemas" = "yes"
  then
      with_pattern=yes
!     with_regexps=yes
  fi
  if test "$with_schematron" = "yes"
  then
***************
*** 268,276 ****
      then
        with_readline=no
      fi
!     if test "$with_regexp" = ""
      then
!       with_regexp=no
      fi
      if test "$with_run_debug" = ""
      then
--- 268,276 ----
      then
        with_readline=no
      fi
!     if test "$with_regexps" = ""
      then
!       with_regexps=no
      fi
      if test "$with_run_debug" = ""
      then