Do not export non-existant symbols

Change-Id: Ic0fb8e5016d064c2227cf5d87ffba86a4303c82b
diff --git a/vpx/exports_enc b/vpx/exports_enc
index 155faf6..07f0280 100644
--- a/vpx/exports_enc
+++ b/vpx/exports_enc
@@ -8,7 +8,6 @@
 text vpx_codec_set_cx_data_buf
 text vpx_svc_dump_statistics
 text vpx_svc_encode
-text vpx_svc_free
 text vpx_svc_get_buffer
 text vpx_svc_get_encode_frame_count
 text vpx_svc_get_frame_size
@@ -22,4 +21,4 @@
 text vpx_svc_set_scale_factors
 text vpx_svc_get_layer_resolution
 text vpx_svc_get_rc_stats_buffer_size
-text vpx_svc_get_rc_stats_buffer
\ No newline at end of file
+text vpx_svc_get_rc_stats_buffer