Update rpm to rev 281 via SR 817222
https://build.opensuse.org/request/show/817222
by user mlschroe + dimstar_suse
- temporarily back out change of %_libexecdir to /usr/libexec
- Update rpmconfigcheck: Remove bashism and use /bin/sh instead of
/bin/bash.
- update auto-config-update-aarch64-ppc64le.diff (bsc#1170849):
* only update if hostarch isn't there
- Remove ocaml-find-provides.sh, ocaml-find-requires.sh, fileattrs/ocaml.attr
ocaml(NAME) = HASH is now handled in ocaml-rpm-macros (bsc#1154874)