ART: Build tests in checkbuild

We should build the tests when a checkbuild is run. That is the
standard configuration to test that everything compiles.

Bug: 24059936
Change-Id: I5a72d9a1b7accdd3e0dcb14edaeccde7ec126d44
diff --git a/Android.mk b/Android.mk
index 8859d3a..397b10c 100644
--- a/Android.mk
+++ b/Android.mk
@@ -33,7 +33,7 @@
 
 # Don't bother with tests unless there is a test-art*, build-art*, or related target.
 art_test_bother := false
-ifneq (,$(filter %tests test-art% valgrind-test-art% build-art%,$(MAKECMDGOALS)))
+ifneq (,$(filter tests test-art% valgrind-test-art% build-art% checkbuild,$(MAKECMDGOALS)))
   art_test_bother := true
 endif