Simplify javabin path resolution

#151

rules/android_local_test/impl.bzl

@@ -255,21 +255,11 @@ def _process_deploy_jar(ctx, java_package, jvm_ctx, proto_ctx, resources_ctx, **
 
 def _preprocess_stub(ctx, **_unused_sub_ctxs):
  javabase = ctx.attr._current_java_runtime[java_common.JavaRuntimeInfo]
- java_executable = str(javabase.java_executable_runfiles_path)
+ java_executable = ctx.attr._java_runtime[java_common.JavaRuntimeInfo].java_executable_exec_path
  java_executable_files = javabase.files
 
- # Absolute java_executable does not require any munging
- if java_executable.startswith("/"):
- java_executable = "JAVABIN=" + java_executable
-
- prefix = ctx.attr._runfiles_root_prefix[BuildSettingInfo].value
- if not java_executable.startswith(prefix):
- java_executable = prefix + java_executable
-
- java_executable = "JAVABIN=${JAVABIN:-${JAVA_RUNFILES}/" + java_executable + "}"
-
  substitutes = {
- "%javabin%": java_executable,
+ "%javabin%": "JAVABIN=" + java_executable,
  "%load_lib%": "",
  "%set_ASAN_OPTIONS%": "",
  }