Write the Java manifest file

Property definitions

nitc :: java_compiler $ ModelBuilder :: write_manifest
	# Write the Java manifest file
	private fun write_manifest(compiler: JavaCompiler) do
		var compile_dir = compiler.compile_dir
		var outname = compiler.outname.to_path.filename
		var maniffile = new FileWriter.open("{compile_dir}/{outname}.mf")
		maniffile.write("Manifest-Version: 1.0\n")
		maniffile.write("Main-Class: {compiler.mainmodule.jname}_Main\n")
		maniffile.close
	end
src/compiler/java_compiler.nit:207,2--215,4