Move output_stream files out of runtime.

Also move image_test and oat_test that are more writing tests.

Change-Id: I6af1400d8e745bbf87f626ca87dae3e2d85b40f1
diff --git a/compiler/Android.mk b/compiler/Android.mk
index 5caf688..3791946 100644
--- a/compiler/Android.mk
+++ b/compiler/Android.mk
@@ -87,6 +87,7 @@
 	elf_stripper.cc \
 	elf_writer.cc \
 	elf_writer_quick.cc \
+	file_output_stream.cc \
 	image_writer.cc \
 	oat_writer.cc \
 	vector_output_stream.cc