bootanimation: enable multithread decode by default

Change-Id: Icb17f58a1165b697465a8e3b780c54ff7784c9c6

Author: invisiblek

cmds/bootanimation/Android.mk

@@ -46,7 +46,7 @@ ifeq ($(TARGET_BOOTANIMATION_USE_RGB565),true)
     LOCAL_CFLAGS += -DUSE_565
 endif
 
-ifeq ($(TARGET_BOOTANIMATION_MULTITHREAD_DECODE),true)
+ifneq ($(TARGET_BOOTANIMATION_MULTITHREAD_DECODE),false)
     LOCAL_CFLAGS += -DMULTITHREAD_DECODE
 endif