Add command-line -enable-cdef option

Change-Id: Ic061eeab1563c249fd9d3738025aac40bc3ee542
diff --git a/aomenc.c b/aomenc.c
index 43ad4bf..0ed4714 100644
--- a/aomenc.c
+++ b/aomenc.c
@@ -428,6 +428,12 @@
 #endif  // CONFIG_LOOPFILTERING_ACROSS_TILES
 static const arg_def_t lossless =
     ARG_DEF(NULL, "lossless", 1, "Lossless mode (0: false (default), 1: true)");
+#if CONFIG_CDEF
+static const arg_def_t enable_cdef =
+    ARG_DEF(NULL, "enable-cdef", 1,
+            "Enable the constrained directional enhancement filter (0: false, "
+            "1: true (default))");
+#endif
 #if CONFIG_AOM_QM
 static const arg_def_t enable_qm =
     ARG_DEF(NULL, "enable-qm", 1,
@@ -567,6 +573,9 @@
                                        &max_inter_rate_pct,
                                        &gf_cbr_boost_pct,
                                        &lossless,
+#if CONFIG_CDEF
+                                       &enable_cdef,
+#endif
 #if CONFIG_AOM_QM
                                        &enable_qm,
                                        &qm_min,
@@ -624,6 +633,9 @@
                                         AV1E_SET_MAX_INTER_BITRATE_PCT,
                                         AV1E_SET_GF_CBR_BOOST_PCT,
                                         AV1E_SET_LOSSLESS,
+#if CONFIG_CDEF
+                                        AV1E_SET_ENABLE_CDEF,
+#endif
 #if CONFIG_AOM_QM
                                         AV1E_SET_ENABLE_QM,
                                         AV1E_SET_QM_MIN,