configure: Simplify link local autoconfiguration

We should either define a variable or not based on the truth value of
the configure flag. This change removes the AC_ARG_VAR that is
duplicating the functionality of the AC_ARG_ENABLE.

Change-Id: Ia77a1a7b5535418a268a3dd2d08ed488b8c6ae18
Signed-off-by: William A. Kennington III <wak@google.com>
1 file changed