Wire up --host_java_toolchain

--
MOS_MIGRATED_REVID=120574676
diff --git a/scripts/bootstrap/bootstrap.sh b/scripts/bootstrap/bootstrap.sh
index d567b0d..d11b6c5 100755
--- a/scripts/bootstrap/bootstrap.sh
+++ b/scripts/bootstrap/bootstrap.sh
@@ -32,11 +32,13 @@
 
 if [ "${JAVA_VERSION}" = "1.7" ]; then
   : ${BAZEL_ARGS:=--java_toolchain=//src/java_tools/buildjar:bootstrap_toolchain_jdk7 \
+        --host_java_toolchain=//src/java_tools/buildjar:bootstrap_toolchain_jdk7 \
         --define JAVA_VERSION=1.7 \
         --genrule_strategy=standalone --spawn_strategy=standalone \
         "${EXTRA_BAZEL_ARGS:-}"}
 else
   : ${BAZEL_ARGS:=--java_toolchain=//src/java_tools/buildjar:bootstrap_toolchain \
+        --host_java_toolchain=//src/java_tools/buildjar:bootstrap_toolchain \
         --strategy=Javac=worker --worker_quit_after_build \
         --genrule_strategy=standalone --spawn_strategy=standalone \
         "${EXTRA_BAZEL_ARGS:-}"}