pgsql: Remove pg_rewind's private logging.h/logging.c files.

Remove pg_rewind's private logging.h/logging.c files.

The existence of these files became rather confusing with the
introduction of a widely-known logging.h header in commit cc8d41511.
(Indeed, there's already some duplicative #includes here, perhaps
betraying such confusion.) The only thing left in them, after that
commit, is a progress-reporting function that's neither general-purpose
nor tied in any way to other logging infrastructure. Hence, let's just
move that function to pg_rewind.c, and get rid of the separate files.

Discussion: https://postgr.es/m/3971.1557787914@sss.pgh.pa.us

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/53ddefbaf8a0493d2c1fa0b18bfaba72da556985

Modified Files
--------------
src/bin/pg_rewind/Makefile | 2 +-
src/bin/pg_rewind/copy_fetch.c | 1 -
src/bin/pg_rewind/file_ops.c | 1 -
src/bin/pg_rewind/filemap.c | 2 --
src/bin/pg_rewind/libpq_fetch.c | 2 --
src/bin/pg_rewind/logging.c | 79 -----------------------------------------
src/bin/pg_rewind/logging.h | 25 -------------
src/bin/pg_rewind/nls.mk | 2 +-
src/bin/pg_rewind/parsexlog.c | 1 -
src/bin/pg_rewind/pg_rewind.c | 62 ++++++++++++++++++++++++++++++--
src/bin/pg_rewind/pg_rewind.h | 12 +++++++
src/bin/pg_rewind/timeline.c | 1 -
12 files changed, 74 insertions(+), 116 deletions(-)