- moced I_DetectOS call into D_DoomMain

This requires the console and was the reason for this strange setup.

src/d_main.cpp

@@ -2286,6 +2286,7 @@ void D_DoomMain (void)
 	const char *batchout = Args->CheckValue("-errorlog");
 
 	C_InitConsole(80*8, 25*8, false);
+	I_DetectOS();
 
 	// +logfile gets checked too late to catch the full startup log in the logfile so do some extra check for it here.
 	FString logfile = Args->TakeValue("+logfile");

src/posix/cocoa/i_main.mm

@@ -90,7 +90,7 @@ - (NSOperatingSystemVersion)operatingSystemVersion;
 
 #endif // before 10.10
 
-static void I_DetectOS()
+void I_DetectOS()
 {
 	NSOperatingSystemVersion version = {};
 	NSProcessInfo* const processInfo = [NSProcessInfo processInfo];
@@ -172,7 +172,6 @@ handler and exit() is called to exit, either
 	progdir = [[exePath stringByDeletingLastPathComponent] UTF8String];
 	progdir += "/";
 
-	I_DetectOS();
 	D_DoomMain();
 }
 

src/posix/sdl/i_main.cpp

@@ -149,6 +149,11 @@ static int DoomSpecificInfo (char *buffer, char *end)
 	return p;
 }
 
+void I_DetectOS()
+{
+	// The POSIX version never implemented this.
+}
+
 void I_StartupJoysticks();
 void I_ShutdownJoysticks();
 

src/win32/i_main.cpp

@@ -979,7 +979,6 @@ void DoMain (HINSTANCE hInstance)
 		CoInitialize (NULL);
 		atexit (UnCOM);
 
-		I_DetectOS ();
 		D_DoomMain ();
 	}
 	catch (class CNoRunExit &)