Fix compilation of sparc64-linux rtl with -dFPC_USE_LIBC

rtl/linux/sparc64/stat.inc

@@ -64,7 +64,7 @@
     st_ctime,
     st_ctime_nsec,
     __unused4_,
-    __unused5_) : cULong;
+    __unused5_ : cULong;
   end;
 
 {$ENDIF FPC_USE_LIBC}