Revert root authentication stuff (#3)

* Revert "Try pkexec"

This reverts commit 0073974.

* Revert "Port root authentication from AppImage/AppImageKit#364"

This reverts commit 1ffe5aa.

main.vala

@@ -8,23 +8,6 @@ static HeaderBar header_bar; // Too new to assume it is there?
 
 static string selected_file;
 
-static string root(){
-
-	var a = Posix.system("pkexec --disable-internal-agent echo hello to appimages");
-	if (a == 32256){
-	return "false";
-	}
-	else{
-	return "true";
-	}
-
-}
-static void root_run(){
-	if(root() == "false"){
-	Posix.exit(0);
-	}
-}
-
 /* Open file */
 static void open_file(string filename) {
     selected_file = filename;
@@ -63,7 +46,6 @@ static void on_about_clicked() {
 }
 
 static void main (string[] args) {
-	root_run();
 	init (ref args);
   if(args.length > 1){
     open_file(args[1]);

progress.vala

@@ -103,9 +103,9 @@ public class ProgressWindow : Window {
             int extra_args = 0;
 
             string[] spawn_args = new string[8 + files_to_be_updated.length + extra_args];
-	    spawn_args[0] = "pkexec";
-	    spawn_args[1] = Environment.get_variable ("APPDIR").concat("/usr/bin/appimageupdate", null);
-	    spawn_args[2] = this.file_name;
+
+	    spawn_args[0] = "appimageupdate";
+	    spawn_args[1] = this.file_name;
 
 	    string[] spawn_env = Environ.get ();
 	    int standard_error;