aom/aom_encoder.h: remove configure option reference
and update it to the CMake equivalent
Bug: aomedia:2673
Change-Id: Ied3e295cd1ffe93500b21e3937eaafebf1438e0f
(cherry picked from commit a786b2d355e414a5bb64ed201403fc961f50d331)
diff --git a/aom/aom_encoder.h b/aom/aom_encoder.h
index 9b0df7a..c324c56 100644
--- a/aom/aom_encoder.h
+++ b/aom/aom_encoder.h
@@ -913,7 +913,7 @@
* function directly, to ensure that the ABI version number parameter
* is properly initialized.
*
- * If the library was configured with --disable-multithread, this call
+ * If the library was configured with -DCONFIG_MULTITHREAD=0, this call
* is not thread safe and should be guarded with a lock if being used
* in a multithreaded context.
*