Add core-lambda-stubs to classpath

Add core-lambda-stubs to the bootclasspath for modules with no
sdk_version or with sdk_version: "current", and to the classpath
for modules that specify a specific sdk_version number.

Fixes compiling modules with lambdas against the SDK.

Bug: 80428539
Test: java_test.go
Change-Id: I5e700f2dd86f1a6b84b7a55dd9bfe21a448d3fb6
diff --git a/java/config/config.go b/java/config/config.go
index d44315c..4a74c7c 100644
--- a/java/config/config.go
+++ b/java/config/config.go
@@ -30,6 +30,7 @@
 	DefaultBootclasspathLibraries = []string{"core-oj", "core-libart"}
 	DefaultSystemModules          = "core-system-modules"
 	DefaultLibraries              = []string{"ext", "framework", "okhttp"}
+	DefaultLambdaStubsLibraries   = []string{"core-lambda-stubs"}
 
 	DefaultJacocoExcludeFilter = []string{"org.junit.*", "org.jacoco.*", "org.mockito.*"}