pgsql: Integrate pg_bsd_indent into our build/test infrastructure.

Integrate pg_bsd_indent into our build/test infrastructure.

Update the Makefile and build directions for in-tree build,
and add Meson build infrastructure. Also convert the ad-hoc
test target into a TAP test.

Currently, the Make build system will not build pg_bsd_indent
by default, while the Meson system will. Both will test it
during "make check-world" or "ninja test". Neither will install
it automatically. (We might change some of these decisions later.)

Also fix a few portability nits noted during early testing.

Also, exclude pg_bsd_indent from pgindent's purview; at least for
now, we'll leave it formatted similarly to the FreeBSD original.

Tom Lane and Andres Freund

Discussion: https://postgr.es/m/3935719.1675967430@sss.pgh.pa.us
Discussion: https://postgr.es/m/20200812223409.6di3y2qsnvynao7a@alap3.anarazel.de

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/156c049beed9d3f243cdceaf89456ea6a2995493

Modified Files
--------------
GNUmakefile.in | 2 +-
src/Makefile | 2 +
src/meson.build | 2 +
src/tools/pg_bsd_indent/.gitignore | 12 ++---
src/tools/pg_bsd_indent/Makefile | 62 +++++++++++++++++---------
src/tools/pg_bsd_indent/README | 37 +++++++++++++++
src/tools/pg_bsd_indent/README.pg_bsd_indent | 30 -------------
src/tools/pg_bsd_indent/args.c | 2 +-
src/tools/pg_bsd_indent/indent.c | 6 +--
src/tools/pg_bsd_indent/indent.h | 2 +-
src/tools/pg_bsd_indent/meson.build | 40 +++++++++++++++++
src/tools/pg_bsd_indent/t/001_pg_bsd_indent.pl | 53 ++++++++++++++++++++++
src/tools/pgindent/exclude_file_patterns | 4 ++
13 files changed, 188 insertions(+), 66 deletions(-)