Makefile: Added missing png library to linker options (issue 141)

Fix the minimum screen size not enforced when resizing window (since r705)
Fix the mouse cursor position when changing pixel size (since r705)
In fileselector, the image preview now enforces "safe colors". (issue 116)


git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@716 416bcca6-2ee7-4201-b75f-2eb2f807beb1

engine.c

@@ -524,8 +524,6 @@ void Main_handler(void)
     {
       Hide_cursor();
       Init_mode_video(Resize_width, Resize_height, 0, Pixel_ratio);
-      Video_mode[0].Width = Screen_width*Pixel_width;
-      Video_mode[0].Height = Screen_height*Pixel_height;
       // Remise à zero des variables indiquant le Redimensionnement demandé
       Display_menu();
       Display_all_screen();