Fix some -Wcast-qual warnings

Small rearrangements to avoid having to cast away qualifiers.  In some
cases, the whole cast was unnecessary.

Reviewed-by: Heikki Linnakangas <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/flat/459217ca-3840-4452-8cd1-8f9b47e8d479%40eisentraut.org

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/e58994c30199258c7abfdfd65140a699faac0a1c

Modified Files
--------------
contrib/btree_gist/btree_bit.c                     |  4 ++--
contrib/btree_gist/btree_utils_var.c               |  4 ++--
contrib/btree_gist/btree_utils_var.h               |  2 +-
contrib/postgres_fdw/connection.c                  | 11 ++++++----
contrib/xml2/xslt_proc.c                           | 15 +++++++-------
src/backend/utils/adt/multirangetypes.c            |  6 +++---
src/backend/utils/adt/rangetypes.c                 |  2 +-
src/backend/utils/adt/varlena.c                    | 24 +++++++++++-----------
src/include/storage/bufpage.h                      |  2 +-
.../test_custom_stats/test_custom_var_stats.c      |  2 +-
10 files changed, 38 insertions(+), 34 deletions(-)

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