Remove unused includes

These haven't been needed for a long time.

Reviewed-by: John Naylor <john.naylor@enterprisedb.com>
Discussion: https://www.postgresql.org/message-id/flat/b239564c-cad0-b23e-c57e-166d883cb97d@enterprisedb.com

src/backend/utils/adt/cash.c

@@ -26,7 +26,6 @@
 #include "libpq/pqformat.h"
 #include "utils/builtins.h"
 #include "utils/cash.h"
-#include "utils/int8.h"
 #include "utils/numeric.h"
 #include "utils/pg_locale.h"
 

src/backend/utils/adt/formatting.c

@@ -92,7 +92,6 @@
 #include "utils/datetime.h"
 #include "utils/float.h"
 #include "utils/formatting.h"
-#include "utils/int8.h"
 #include "utils/memutils.h"
 #include "utils/numeric.h"
 #include "utils/pg_locale.h"

src/backend/utils/adt/numeric.c

@@ -39,7 +39,6 @@
 #include "utils/builtins.h"
 #include "utils/float.h"
 #include "utils/guc.h"
-#include "utils/int8.h"
 #include "utils/numeric.h"
 #include "utils/pg_lsn.h"
 #include "utils/sortsupport.h"

src/backend/utils/adt/rangetypes.c

@@ -37,7 +37,6 @@
 #include "miscadmin.h"
 #include "utils/builtins.h"
 #include "utils/date.h"
-#include "utils/int8.h"
 #include "utils/lsyscache.h"
 #include "utils/rangetypes.h"
 #include "utils/timestamp.h"