Remove unneeded volatile qualifiers from postc.
Several flags were marked volatile and in some cases used sig_atomic_t
because they were accessed from signal handlers. After commit
7389aad6,
we can just use unqualified bool.
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CA%2BhUKGLMoeZNZY6gYdLUQmuoW_a8bKyLvtuZkd_zHcGVOfDzBA%40mail.gmail.com