pgsql: Add "headerscheck" script to test header-file compilability unde

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pgsql: Add "headerscheck" script to test header-file compilability unde

Tom Lane-2
Add "headerscheck" script to test header-file compilability under C.

We already had "cpluspluscheck", which served the dual purposes of
verifying that headers compile standalone and that they compile as C++.
However, C++ compilers don't have the exact same set of error conditions
as C compilers, so this doesn't really prove that a header will compile
standalone as C.

Hence, add a second script that's largely similar but runs the C
compiler not C++.

Also add a bit more documentation than the none-at-all we had before.

Discussion: https://postgr.es/m/14803.1566175851@...

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/55ea109188474dae22d90f743d7189a8bdf94d49

Modified Files
--------------
GNUmakefile.in                     |   5 +-
src/tools/pginclude/README         |  48 ++++++++++++
src/tools/pginclude/cpluspluscheck |   5 ++
src/tools/pginclude/headerscheck   | 153 +++++++++++++++++++++++++++++++++++++
4 files changed, 210 insertions(+), 1 deletion(-)