[PATCH] fix configure.ac typo

[Kevin J. McCarthy]

Attached is a patch to fix a configure.ac typo.  After running
AC_SEARCH_LIBS([stringprep_check_version]...), the variable
$ac_cv_search_STRINGPREP_CHECK_VERSION was used instead of
$ac_cv_search_stringprep_check_version.

This was giving a "test: =: unary operator expected" error.

-Kevin

# HG changeset patch
# User Kevin McCarthy <ke...@8t8.us>
# Date 1408072348 25200
#      Thu Aug 14 20:12:28 2014 -0700
# Node ID 3b67161e32dbe9f9c49c5ba0bcd9e6b5f434bd95
# Parent  8f62001989cc9f564236e54b318ecca05f551af2
Fix typo in configure.ac.

$ac_cv_search_STRINGPREP_CHECK_VERSION should be
$ac_cv_search_stringprep_check_version, to match the first parameter of
the AC_SEARCH_LIBS([stringprep_check_version] above.

Running configure was giving a "test: =: unary operator expected" error.

diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
@@ -1178,17 +1178,17 @@
       AC_DEFINE([HAVE_LIBIDN], 1, [Define to 1 if you have the GNU idn 
library])
       MUTT_LIB_OBJECTS="$MUTT_LIB_OBJECTS mutt_idna.o"
       AC_CHECK_FUNCS(idna_to_unicode_utf8_from_utf8 idna_to_unicode_8z8z)
       AC_CHECK_FUNCS(idna_to_ascii_from_utf8 idna_to_ascii_8z)
       AC_CHECK_FUNCS(idna_to_ascii_lz idna_to_ascii_from_locale)
     ])
 
     if test "$with_idn" != auto; then
-      if test $have_stringprep_h = no || test $have_idna_h = no || test 
$ac_cv_search_STRINGPREP_CHECK_VERSION = no; then
+      if test $have_stringprep_h = no || test $have_idna_h = no || test 
$ac_cv_search_stringprep_check_version = no; then
        AC_MSG_ERROR([IDN was requested, but libidn was not usable on this 
system])
       fi
     fi
   fi
 fi
 
 dnl -- locales --
 

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