message: [tfls.metadata] Use java7 version opts to build metadata lib.
diff: @@ -472,6 +472,7 @@ def flatbuffer_java_library(
  native.java_library(
  name = name,
  srcs = [out_srcjar],
  + javacopts = ["-source 7 -target 7"],
  deps = [
  "@flatbuffers//:runtime_java",
  ],
  @@ -562,7 +563,6 @@ def flatbuffer_android_library(
  srcs,
  custom_package = "",
  package_prefix = "",
  - javacopts = None,
  include_paths = DEFAULT_INCLUDE_PATHS,
  flatc_args = DEFAULT_FLATC_ARGS,
  visibility = None):
  @@ -575,7 +575,6 @@ def flatbuffer_android_library(
  namespace in the schema files will be used. (optional)
  package_prefix: like custom_package, but prefixes to the existing
  namespace. (optional)
  - javacopts: List of options to pass to javac.
  include_paths: List of paths that includes files can be found in. (optional)
  flatc_args: List of additional arguments to pass to flatc. (optional)
  visibility: Visibility setting for the android_library rule. (optional)
  @@ -604,6 +603,7 @@ def flatbuffer_android_library(
  android_library(
  name = name,
  srcs = [out_srcjar],
  + javacopts = ["-source 7 -target 7"],
  visibility = visibility,
  deps = [
  "@flatbuffers//:runtime_android",
  