* Change win32 client Sys_Sleep so it ONLY sleeps since before it was waking on

more or less any input event; fine for the server, not so much use for the
  client
* In the main loop, don't bother sleeping if it's going to be less than 10ms as
  the methods we're using to sleep at the moment aren't very precise
* Add Sys_PlatformInit for platform specific initialisation
* In win32 Sys_PlatformInit force selection of the DirectX SDL backend in order
  to get better fullscreen mouse input (in conjunction with a patched SDL DLL
  http://bugzilla.libsdl.org/show_bug.cgi?id=265)

code/sys/sys_local.h

@@ -47,6 +47,7 @@ unsigned int CON_LogRead( char *out, unsigned int outSize );
 char *Sys_StripAppBundle( char *pwd );
 #endif
 
+void Sys_PlatformInit( void );
 void Sys_SigHandler( int signal );
 void Sys_ErrorDialog( const char *error );
 void Sys_AnsiColorPrint( const char *msg );