amcheck: Use correct varlena size accessor in bt_normalize_tuple()

bt_normalize_tuple() uses VARSIZE() to get the size of varlena, even though
it's not yet known, that it has a 4-byte header.  Fix this by replacing a
accessor with a universal VARSIZE_ANY().

Backpatch to all supported versions.

Reported-by: Andres Freund <[email protected]>
Discussion: 
https://postgr.es/m/7ckc7oka4bvafkf5bwlqs6ygrhlsbhz25ppozfch7zbuxcx3rf%40e4pr4oqenalc
Author: Andrey Borodin <[email protected]>
Reviewed-by: Alexander Korotkov <[email protected]>
Backpatch-through: 14

Branch
------
REL_14_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/af09b18cbadbb91ffe617b9ee5549de420e9b21a

Modified Files
--------------
contrib/amcheck/verify_nbtree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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