Add Bouncy Castle to classpath in run-libcore-tests.

Most security-related tests are failing unless Bouncy Castle is in
the classpath because they create a KeyStore of algorithm "BKS".

Change-Id: I8138523015f2e281f25b3210b43c71ebff1bf804
diff --git a/run-libcore-tests b/run-libcore-tests
index 79c4d07..ef30877 100755
--- a/run-libcore-tests
+++ b/run-libcore-tests
@@ -23,5 +23,6 @@
   --vm-arg -Xmx32M \
   --classpath out/target/common/obj/JAVA_LIBRARIES/core-tests_intermediates/javalib.jar \
   --classpath out/target/common/obj/JAVA_LIBRARIES/sqlite-jdbc_intermediates/classes.jar \
+  --classpath out/target/common/obj/JAVA_LIBRARIES/bouncycastle_intermediates/classes.jar \
   $test_packages \
   || true