posix/sdl: fix build

engine/platform/posix/sys_posix.c

@@ -17,6 +17,7 @@ GNU General Public License for more details.
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <errno.h>
 #include "platform/platform.h"
 #include "menu_int.h"
 

engine/platform/sdl/sys_sdl.c

@@ -49,6 +49,7 @@ void Platform_Init( void )
 {
 #ifndef SDL_INIT_EVENTS
 #define SDL_INIT_EVENTS 0
+#endif
 
 	if( SDL_Init( SDL_INIT_TIMER | SDL_INIT_VIDEO | SDL_INIT_EVENTS ) )
 	{