Inform Jack of the min sdk

Set Jack min sdk according to LOCAL_SDK_VERSION. Gives Jack current
version when LOCAL_SDK_VERSION is not available.

Bug: 27371864

(cherry picked from commit c6383d6ec665a0d0c7c866890845c5735a298b6b)

Change-Id: Ieba0219494f29d2737d2ca234317c3af7e5e72c8
diff --git a/core/prebuilt_internal.mk b/core/prebuilt_internal.mk
index eba9f32..c0a533a 100644
--- a/core/prebuilt_internal.mk
+++ b/core/prebuilt_internal.mk
@@ -371,6 +371,7 @@
 
 # We may be building classes.jack from a host jar for host dalvik Java library.
 $(intermediates.COMMON)/classes.jack : PRIVATE_JACK_FLAGS:=$(LOCAL_JACK_FLAGS)
+$(intermediates.COMMON)/classes.jack : PRIVATE_JACK_MIN_SDK_VERSION := 1
 $(intermediates.COMMON)/classes.jack : $(my_src_jar) $(LOCAL_MODULE_MAKEFILE_DEP) \
         $(LOCAL_ADDITIONAL_DEPENDENCIES) $(JACK) | setup-jack-server
 	$(transform-jar-to-jack)