Workaround JDWP failures

Compile JDWP tests in 1.7 to workaround debug info issues.

Bug: 27262745
Change-Id: I4630a0346d5a99f94895557d705dad310735b45f
diff --git a/tools/run-jdwp-tests.sh b/tools/run-jdwp-tests.sh
index e4af9fa..fda630f 100755
--- a/tools/run-jdwp-tests.sh
+++ b/tools/run-jdwp-tests.sh
@@ -133,7 +133,7 @@
       --vm-arg -Djpda.settings.transportAddress=127.0.0.1:55107 \
       --vm-arg -Djpda.settings.debuggeeJavaPath="$art_debugee $image $debuggee_args" \
       --classpath $test_jack \
-      --toolchain jack --language JN \
+      --toolchain jack \
       --vm-arg -Xcompiler-option --vm-arg --debuggable \
       $test