pgsql: Rename sort support integer comparators for clarity

Rename sort support integer comparators for clarity

The previous names used "unsigned" for Datum-width abbreviated keys
and "signed" for 64-bit signed integers. This may have made more
sense when Datum width was platform-dependent, but commit 805c64f84
added a 32-bit unsigned variant for OIDs, so it makes even less sense
now. Rename all to be explicit about signedness and width.

Suggested-by: David Rowley <dgrowleyml(at)gmail(dot)com>
Discussion: https://postgr.es/m/CAApHDvrNMz5ahN1x=uK9yscTogmLupfLBy-_qMW9Z+k=HE5u_A@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/19733fa0b42caffa92463bb8a8098a40d8963d76

Modified Files
--------------
src/backend/access/gist/gistproc.c | 2 +-
src/backend/access/nbtree/nbtcompare.c | 4 ++--
src/backend/utils/adt/bytea.c | 4 ++--
src/backend/utils/adt/mac.c | 4 ++--
src/backend/utils/adt/network.c | 2 +-
src/backend/utils/adt/timestamp.c | 2 +-
src/backend/utils/adt/uuid.c | 4 ++--
src/backend/utils/adt/varlena.c | 4 ++--
src/backend/utils/sort/tuplesort.c | 12 ++++++------
src/include/utils/sortsupport.h | 4 ++--
10 files changed, 21 insertions(+), 21 deletions(-)