Pull up the following revisions, requested by joerg in ticket #1409:

external/bsd/pkg_install/dist/add/perform.c    up to 1.6
external/bsd/pkg_install/dist/add/pkg_add.1    up to 1.3
external/bsd/pkg_install/dist/admin/audit.c    up to 1.3
external/bsd/pkg_install/dist/admin/main.c      up to 1.4
external/bsd/pkg_install/dist/admin/pkg_admin.1 up to 1.5
external/bsd/pkg_install/dist/create/util.c    up to 1.2
external/bsd/pkg_install/dist/delete/pkg_delete.c up to 1.3
external/bsd/pkg_install/dist/info/main.c      up to 1.3
external/bsd/pkg_install/dist/lib/lib.h        up to 1.9
external/bsd/pkg_install/dist/lib/license.c    up to 1.9
external/bsd/pkg_install/dist/lib/parse-config.c up to 1.3
external/bsd/pkg_install/dist/lib/pkcs7.c      up to 1.4
external/bsd/pkg_install/dist/lib/pkg_io.c      up to 1.3
external/bsd/pkg_install/dist/lib/version.h    up to 1.15
external/bsd/pkg_install/dist/lib/vulnerabilities-file.c up to 1.3

Merge pkg_install-20191008 from pkgsrc.

(martin)