launcher: multirun should work on POSIX now

launcher/launcher.cpp

@@ -1278,6 +1278,10 @@ DLL_EXPORT int LauncherMain( int argc, char **argv )
 	// Figure out the directory the executable is running from
 	UTIL_ComputeBaseDir();
 
+	// Allow the user to explicitly say they want to be able to run multiple instances of the source mutex.
+	// Useful for side-by-side comparisons of different renderers.
+	bool multiRun = CommandLine()->CheckParm( "-multirun" ) != NULL;
+
 #if defined( _X360 )
 	bool bSpewDllInfo = CommandLine()->CheckParm( "-dllinfo" );
 	bool bWaitForConsole = CommandLine()->CheckParm( "-vxconsole" );
@@ -1389,10 +1393,6 @@ DLL_EXPORT int LauncherMain( int argc, char **argv )
 		// Can only run one windowed source app at a time
 		if ( !GrabSourceMutex() )
 		{
-			// Allow the user to explicitly say they want to be able to run multiple instances of the source mutex.
-			// Useful for side-by-side comparisons of different renderers.
-			bool multiRun = CommandLine()->CheckParm( "-multirun" ) != NULL;
-
 			// We're going to hijack the existing session and load a new savegame into it. This will mainly occur when users click on links in Bugzilla that will automatically copy saves and load them
 			// directly from the web browser. The -hijack command prevents the launcher from objecting that there is already an instance of the game.
 			if (CommandLine()->CheckParm( "-hijack" ))
@@ -1443,7 +1443,7 @@ DLL_EXPORT int LauncherMain( int argc, char **argv )
 #elif defined( POSIX )
 	else
 	{
-		if ( !GrabSourceMutex() )
+		if ( !GrabSourceMutex() && !multiRun )
 		{
 			::MessageBox(NULL, "Only one instance of the game can be running at one time.", "Source - Warning", 0 );
 			return -1;