[Rpm-maint] [rpm-software-management/rpm] Incorrect escaping in some file attribute regexes (Issue #3212)

[Michal Domonkos]

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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