Mark more targets as PHONY

So that we can start restricting non-phony targets to $OUT_DIR and
$DIST_DIR.

Test: add --writable=out/, see fewer warnings
Change-Id: I411fe4af732b1bce35d4a4c1e2a47b5f8a15e6b8
diff --git a/core/host_java_library.mk b/core/host_java_library.mk
index db24542..2aed61e 100644
--- a/core/host_java_library.mk
+++ b/core/host_java_library.mk
@@ -93,6 +93,7 @@
 
 javac-check : $(full_classes_compiled_jar)
 javac-check-$(LOCAL_MODULE) : $(full_classes_compiled_jar)
+.PHONY: javac-check-$(LOCAL_MODULE)
 
 $(full_classes_combined_jar): $(full_classes_compiled_jar) \
                               $(jar_manifest_file) \