Remove duplicated shouldUncompressDex logic

shouldUncompressDex has already been computed and stored in
deviceProperties.UncompressDex, pass it to dexpreopter instead
of recomputing it.

Also add a stub for java libraries to set UncompressDex.

Test: no change to build.ninja
Change-Id: I663d9fbbe768a8dc9a97c7d456dd7a010f43162d

java/app.go

@@ -213,7 +213,6 @@ func (a *AndroidApp) generateAndroidBuildActions(ctx android.ModuleContext) {
 		installDir = filepath.Join("app", ctx.ModuleName())
 	}
 	a.dexpreopter.installPath = android.PathForModuleInstall(ctx, installDir, ctx.ModuleName()+".apk")
-	a.dexpreopter.isPrivApp = Bool(a.appProperties.Privileged)
 
 	if ctx.ModuleName() != "framework-res" {
 		a.Module.compile(ctx, a.aaptSrcJar)