MethodHandles: Remove reference to Jack 4.11.BETA from build rule.

It is no longer necessary, since the default Jack can handle
invoke-polymorphic now.

Test: make test-art-host

Change-Id: I0439fe1729c2204627408c1975b9c8b965328397
diff --git a/test/956-methodhandles/build b/test/956-methodhandles/build
index 613e97c..a423ca6 100755
--- a/test/956-methodhandles/build
+++ b/test/956-methodhandles/build
@@ -20,9 +20,6 @@
 if [[ $@ != *"--jvm"* ]]; then
   # Don't do anything with jvm.
   export USE_JACK=true
-  export JACK_SERVER=false
-  export JACK_REPOSITORY="${ANDROID_BUILD_TOP}/prebuilts/sdk/tools/jacks"
-  export JACK_VERSION=4.11.BETA
 fi
 
 ./default-build "$@" --experimental method-handles