
Similar to commit 6198420ad, replace is_member_of_role with has_privs_for_role for predefined role access checks in recently committed basebackup code. In passing fix a double-word error in a nearby comment. Discussion: https://postgr.es/m/flat/CAGB+Vh4Zv_TvKt2tv3QNS6tUM_F_9icmuj0zjywwcgVi4PAhFA@mail.gmail.com