Eclipse compiler ignores the module source path set through file manager

[jarthana]

I will try to add a test case to demonstrate this. But here's what happens:

1. We get the EclipseCompiler with something like this:
   CompilationTask task = compiler.getTask(printWriter, filemanager, listener, copyOptions, null, units);
2. Set the module source path on the file manager:

fileManager.setLocationForModule(
  				StandardLocation.MODULE_SOURCE_PATH,
  				modName,
  				Collections.singleton(Paths.get(srcFolderName, modName)));

3. Invoke compiler: task.call()

Now, the problem is, getTask() initiates the compiler, calling Main#configure() which eventually fails at handleSingleModuleCompilation() because --module-source-path has not been passed as a regular argument.