bp2build conversion for rscript srcs in cc modules

Bazel does not support using .rscrip/.fs files as cc srcs.
For a module foo with foo srcs, Bp2build will create a bazel
target of rule class rscript_to_cpp with name foo_renderscript
which will have only the renderscript files as srcs.
Bp2build will also create a target foo with the expected cc rule class.
The foo target will have all other src files as srcs and will also
have the target foo_renderscript as another src.

Bug: 210509914
Test: bp2build testing & b build target rstest-latency
Change-Id: Ifdc55051a3595f5fcf54eab8b59e11e9351e141c
diff --git a/cc/config/global.go b/cc/config/global.go
index 8ff5f55..e450ba7 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -448,11 +448,12 @@
 	pctx.StaticVariable("RSLLVMPrebuiltsPath", "${RSClangBase}/${HostPrebuiltTag}/${RSClangVersion}/bin")
 	pctx.StaticVariable("RSIncludePath", "${RSLLVMPrebuiltsPath}/../lib64/clang/${RSReleaseVersion}/include")
 
-	pctx.PrefixedExistentPathsForSourcesVariable("RsGlobalIncludes", "-I",
-		[]string{
-			"external/clang/lib/Headers",
-			"frameworks/rs/script_api/include",
-		})
+	rsGlobalIncludes := []string{
+		"external/clang/lib/Headers",
+		"frameworks/rs/script_api/include",
+	}
+	pctx.PrefixedExistentPathsForSourcesVariable("RsGlobalIncludes", "-I", rsGlobalIncludes)
+	exportedVars.ExportStringList("RsGlobalIncludes", rsGlobalIncludes)
 
 	pctx.VariableFunc("CcWrapper", func(ctx android.PackageVarContext) string {
 		if override := ctx.Config().Getenv("CC_WRAPPER"); override != "" {