Some of the `*.attr` files we bundle with rpm are using incorrect regex
escaping of the dot character. Since the macro expansion engine itself
recognizes the backslash escape character, it strips its occurrences from the
macro body upon expansion. To fix that, every backslash needs to be escaped
itself.
Example of a bad escape from
[fileattrs/elf.attr](https://github.com/rpm-software-management/rpm/blob/master/fileattrs/elf.attr):
`%__elf_exclude_path ^/lib/modules/.*\.ko?(\.[[:alnum:]]*)$`
Example of a good escape from
[fileattrs/sysusers.attr](https://github.com/rpm-software-management/rpm/blob/master/fileattrs/sysusers.attr):
`%__sysusers_path ^%{_sysusersdir}/.*\\.conf$`
There was a similar case in the redhat-rpm-config package shipped in
Fedora/RHEL which is addressed by
https://src.fedoraproject.org/rpms/redhat-rpm-config/pull-request/309. I've
also seen this issue in some other `*.attr` files shipped by other packages,
specifically in `kmod.attr` so we may want to fix those in their respective
repos, too.
The original issue was reported via the ticket
[RHEL-28767](https://issues.redhat.com/browse/RHEL-28767).
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