Make CheckJNI and JNI workarounds mutually exclusive...

...in the opposite direction; needing workarounds turns off CheckJNI.
This isn't necessarily a good idea, but I like the cleanup parts of
this change.

Change-Id: I708235ea3e5cc35ef90b01dd810e097e3ff9dd26
diff --git a/build/Android.common.mk b/build/Android.common.mk
index 20a73b5..51b0f4f 100644
--- a/build/Android.common.mk
+++ b/build/Android.common.mk
@@ -185,6 +185,7 @@
 	src/runtime.cc \
 	src/runtime_support.cc \
 	src/runtime_support_common.cc \
+	src/scoped_thread_list_lock.cc \
 	src/signal_catcher.cc \
 	src/space.cc \
 	src/stack.cc \