Stub Sys_Init() for Unix and call it while initializing

src/common/header/common.h

@@ -730,6 +730,7 @@ void SCR_DebugGraph (float value, int color);
 
 /* NON-PORTABLE SYSTEM SERVICES */
 
+void	Sys_Init (void);
 void	Sys_UnloadGame (void);
 void	*Sys_GetGameAPI (void *parms);
 

src/common/misc.c

@@ -236,6 +236,7 @@ void Qcommon_Init (int argc, char **argv)
 	if (dedicated->value)
 		Cmd_AddCommand ("quit", Com_Quit);
 
+	Sys_Init();
 	NET_Init();
 	Netchan_Init ();
 	SV_Init ();

src/unix/system.c

@@ -94,6 +94,11 @@ CompareAttributes ( char *path, char *name, unsigned musthave, unsigned canthave
 	return ( true );
 }
 
+void
+Sys_Init ( void )
+{
+}
+
 int
 Sys_Milliseconds ( void )
 {