gui: Remove enableSandbox() for general GUI

While f67a37bc21 indicated the last remaining code could stay,
it can't because there is a launch failure of SandboxedProcessor.

This has been revealed by the changes of the previous commit,
aa03d0a4920e.

Hence, the GUI will be untouched by exile. We only sandbox
the preview generation and the indexing trough IPC.

gui/main.cpp

@@ -15,25 +15,6 @@
 #include "../submodules/exile.h/exile.h"
 #include "ipcserver.h"
 
-void enableSandbox()
-{
-	struct exile_policy *policy = exile_create_policy();
-	if(policy == NULL)
-	{
-		qCritical() << "Failed to init policy for sandbox";
-		exit(EXIT_FAILURE);
-	}
-	policy->namespace_options = 0;
-	policy->no_new_privs = 1;
-	int ret = exile_enable_policy(policy);
-	if(ret != 0)
-	{
-		qDebug() << "Failed to establish sandbox";
-		exit(EXIT_FAILURE);
-	}
-	exile_free_policy(policy);
-}
-
 void enableIpcSandbox()
 {
 	struct exile_policy *policy = exile_create_policy();
@@ -139,15 +120,6 @@ int main(int argc, char *argv[])
 	try
 	{
 		Common::ensureConfigured();
-		if(!parser.isSet("no-sandbox"))
-		{
-			enableSandbox();
-			qInfo() << "Sandbox: on";
-		}
-		else
-		{
-			qInfo() << "Sandbox: off";
-		}
 	}
 	catch(LooqsGeneralException &e)
 	{