gdeque: remove unused variable

(cherry picked from commit 69883e04f151909c3469671a4ae21f1dfb0d31df)

packages/fcl-stl/src/gdeque.pp

@@ -236,7 +236,7 @@ const
   cSizeSmall = 1*1024*1024;
   cSizeBig = 256*1024*1024;
 var
-  i,OldEnd,
+  OldEnd,
   DataSize,CurLast,EmptyElems,Elems:SizeUInt;
 begin
   OldEnd:=FCapacity;