pgsql: Remove no longer needed casts to Pointer

Remove no longer needed casts to Pointer

These casts used to be required when Pointer was char *, but now it's
void * (commit 1b2bb5077e9), so they are not needed anymore.

Reviewed-by: Chao Li <li(dot)evan(dot)chao(at)gmail(dot)com>
Reviewed-by: Bertrand Drouvot <bertranddrouvot(dot)pg(at)gmail(dot)com>
Discussion: https://www.postgresql.org/message-id/4154950a-47ae-4223-bd01-1235cc50e933%40eisentraut.org

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/c6be3daa054a2fac67331f3bfc348b9bfd6f690c

Modified Files
--------------
contrib/btree_gist/btree_utils_var.h | 2 +-
src/backend/access/heap/heaptoast.c | 4 ++--
src/backend/catalog/aclchk.c | 18 +++++++++---------
src/backend/catalog/pg_constraint.c | 12 ++++++------
src/backend/utils/adt/arrayfuncs.c | 2 +-
src/backend/utils/adt/datum.c | 6 +++---
src/backend/utils/adt/like_support.c | 4 ++--
src/backend/utils/adt/numeric.c | 6 +++---
src/backend/utils/adt/rangetypes.c | 4 ++--
src/backend/utils/adt/rowtypes.c | 4 ++--
src/backend/utils/cache/evtcache.c | 2 +-
src/include/fmgr.h | 2 +-
12 files changed, 33 insertions(+), 33 deletions(-)