Only some of the binaries in /usr/lib/postgresql-.../bin should be marked postgresql_exec_t (e.g. pg_ctl), the others (e.g. psql) should get a bin_t marking so they're user-accessible. refpolicy applies correct labels since last year (commit 3738cf10), but this ifdef block still overrides them on Gentoo.
Created attachment 414276 [details, diff] Patch for SELinux policy
applied in master, thanks
r10 released in ~arch
stable now