fix configure typo

Change-Id: I8d98c2ad986cc2ee0516d7b2b607e5db75a6943d
Reviewed-on: https://gerrit.libreoffice.org/25487
Reviewed-by: Jochen Nitschke <j.nitschke+logerrit@ok.de>
Tested-by: Jochen Nitschke <j.nitschke+logerrit@ok.de>
diff --git a/configure.ac b/configure.ac
index b88f81b..b9565a9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2027,7 +2027,7 @@ AC_ARG_WITH(symbol-config,
    AS_HELP_STRING([--with-symbol-config],
        [Configuration for the crashreport symbol upload]),
        [],
        [$with_symbol_config=no])
        [with_symbol_config=no])

AC_ARG_WITH(export-validation,
    AS_HELP_STRING([--with-export-validation],