RPM's macro engine itself understands backslash escapes so we need to
double-escape these, otherwise we may accidentally match symlink targets
that contain the substring "so" in their names, such as:
libechosounder.so -> libechosounder2.so
~~
^ this is currently matched
Whereas we only want these to be processed:
libechosounder.so -> libechosounder.so.2
~~~~~
^ this should be matched
Resolves: RHEL-28767