Revert "Fix configure ODBC logic"

This reverts commit ef35dc63.

configure.in

@@ -402,17 +402,15 @@ AM_CONDITIONAL([ENABLE_ZRTP],[test "x$enable_zrtp" != "xno"])
 
 AM_CONDITIONAL([WANT_DEBUG],[test "${enable_debug}" = "yes"])
 
+enable_core_odbc_support="no"
 AC_ARG_ENABLE(core-odbc-support,     
-	[AS_HELP_STRING([--enable-core-odbc-support], [Compile with ODBC Support])],[enable_core_odbc_support="yes"],[enable_core_odbc_support="no"])
+	[AS_HELP_STRING([--enable-core-odbc-support], [Compile with ODBC Support])],,[enable_core_odbc_support="no"])
 if test "x$enable_core_odbc_support" != "xno"; then
   AX_LIB_ODBC
-  if test "x$ac_cv_found_odbc" = "xyes"; then
+  if test "x$ac_cv_found_odbc" = "xyes" ; then
     enable_core_odbc_support="yes"
-  else
-    if test "x$enable_core_odbc_support" = "xyes"; then
-      AC_MSG_ERROR([no usable libodbc; please install unixodbc devel package or equivalent])
-    else
-      enable_core_odbc_support="no"
+  elif test "x$enable_core_odbc_support" = "xyes" ; then
+    AC_MSG_ERROR([no usable libodbc; please install unixodbc devel package or equivalent])
   fi
 fi