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Use standard `main` return values

`WinMain` has weird rules for this, and they don't match `main`.

--- a/src/Main.cpp

+++ b/src/Main.cpp

@@ -2,6 +2,7 @@

 #include <stddef.h>

 #include <stdio.h>

+#include <stdlib.h>

 #include <string.h>

 #include "SDL.h"

@@ -220,12 +221,12 @@

 			if (conf.display_mode == 1)

 			{

 				if (!StartDirectDraw(lpWindowName, windowWidth, windowHeight, 0))

-					return 0;

+					return EXIT_FAILURE;

 			}

 			else

 			{

 				if (!StartDirectDraw(lpWindowName, windowWidth, windowHeight, 1))

-					return 0;

+					return EXIT_FAILURE;

 			}

 		#else

 			// Doesn't handle StartDirectDraw failing

@@ -246,7 +247,7 @@

 		#ifdef FIX_BUGS

 			if (!StartDirectDraw(lpWindowName, windowWidth, windowHeight, 2))

-				return 0;

+				return EXIT_FAILURE;

 		#else

 			// Doesn't handle StartDirectDraw failing

 			StartDirectDraw(lpWindowName, windowWidth, windowHeight, 2);

@@ -292,7 +293,7 @@

 	{

         SDL_FreeCursor(cursor);

         SDL_FreeSurface(cursor_surface);

-		return 1;

+		return EXIT_SUCCESS;

 	}

 	// Initialize sound

@@ -320,7 +321,7 @@

 	SDL_FreeCursor(cursor);

 	SDL_FreeSurface(cursor_surface);

-	return 1;

+	return EXIT_SUCCESS;

 }

 void InactiveWindow(void)