wfd: Deleted video-techpack flag

Deleting variant build support.

Change-Id: Iada5741fe44c19d3a33e1d95378fdb5b200ada03
diff --git a/libaac/Android.mk b/libaac/Android.mk
index 7669080..96a7fe2 100644
--- a/libaac/Android.mk
+++ b/libaac/Android.mk
@@ -1,4 +1,3 @@
-ifeq ($(BUILD_VIDEO_TECHPACK_SOURCE), true)
 LOCAL_PATH := $(call my-dir)
 
 include $(CLEAR_VARS)
@@ -28,4 +27,3 @@
 
 LOCAL_SANITIZE := integer_overflow
 include $(BUILD_SHARED_LIBRARY)
-endif # BUILD_VIDEO_TECHPACK_SOURCE