Add `libcore.build` tests to the ART Libcore test suite.

Tests execution time: 5.06s on host, 6.78s on device (Pixel XL).

Test: Run Libcore tests on host and target
Change-Id: I2110140e27d736bf9dbf144170c8667341d624bc
diff --git a/tools/run-libcore-tests.sh b/tools/run-libcore-tests.sh
index be09f57..21e7ed4 100755
--- a/tools/run-libcore-tests.sh
+++ b/tools/run-libcore-tests.sh
@@ -84,6 +84,7 @@
 
 # Packages that currently work correctly with the expectation files.
 working_packages=("libcore.android.system"
+                  "libcore.build"
                   "libcore.dalvik.system"
                   "libcore.java.lang"
                   "libcore.java.math"