Move pointer range comparisons into a macro, where they can be dealt with

in a more portable way.

FossilOrigin-Name: ad3124c834b080aaaf24934d6f08b3601ac3ae53

src/btree.c

@@ -7521,13 +7521,7 @@ static int balance_nonroot(
       ** overflow cell), we can skip updating the pointer map entries.  */
       if( iOld>=nNew
        || pNew->pgno!=aPgno[iOld]
-#ifdef HAVE_STDINT_H
-       || (intptr_t)pCell<(intptr_t)aOld
-       || (intptr_t)pCell>=(intptr_t)&aOld[usableSize]
-#else
-       || pCell<aOld
-       || pCell>=&aOld[usableSize]
-#endif
+       || !SQLITE_WITHIN(pCell,aOld,&aOld[usableSize])
       ){
         if( !leafCorrection ){
           ptrmapPut(pBt, get4byte(pCell), PTRMAP_BTREE, pNew->pgno, &rc);