pgsql: Move astreamer (except astreamer_inject) to fe_utils.

Move astreamer (except astreamer_inject) to fe_utils.

This allows the code to be used by other frontend applications.

Amul Sul, reviewed by Sravan Kumar, Andres Freund (whose input
I specifically solicited regarding the meson.build changes),
and me.

Discussion: http://postgr.es/m/CAAJ_b94StvLWrc_p4q-f7n3OPfr6GhL8_XuAg2aAaYZp1tF-nw@mail.gmail.com

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/f80b09bac87d6b49f5dbb6131da5fbd9b9773c5c

Modified Files
--------------
meson.build | 2 +-
src/bin/pg_basebackup/Makefile | 7 +------
src/bin/pg_basebackup/astreamer_inject.h | 2 +-
src/bin/pg_basebackup/meson.build | 5 -----
src/fe_utils/Makefile | 5 +++++
src/{bin/pg_basebackup => fe_utils}/astreamer_file.c | 2 +-
src/{bin/pg_basebackup => fe_utils}/astreamer_gzip.c | 2 +-
src/{bin/pg_basebackup => fe_utils}/astreamer_lz4.c | 2 +-
src/{bin/pg_basebackup => fe_utils}/astreamer_tar.c | 2 +-
src/{bin/pg_basebackup => fe_utils}/astreamer_zstd.c | 2 +-
src/fe_utils/meson.build | 5 +++++
src/{bin/pg_basebackup => include/fe_utils}/astreamer.h | 0
12 files changed, 18 insertions(+), 18 deletions(-)