install: pkglibexec_SCRIPTS is a valid prefix/primary combination It makes little sense for `libexec_SCRIPTS' to be accepted as valid while `pkglibexec_SCRIPTS' is not. So fix this inconsistency by explicitly allowing `pkglibexec_SCRIPTS' as well. It is worth noting that the inconsistency has been there for a long time, but only the quite recent commit `v1.11-373-g9ca6326' "Warnings about primary/prefix mismatch fixed and extended" has made it noisy enough to be noticed. * automake.in (handle_scripts): Also list `pkglibexec' among the prefixes valid for the `SCRIPTS' primary. * doc/automake.texi (Scripts): Likewise. * tests/primary-prefix-valid-couples.test: Update. * THANKS: Likewise. * NEWS: Likewise. Reported by Dennis Schridde on the automake list: <http://lists.gnu.org/archive/html/automake/2012-01/msg00002.html>