[elfutils] drop unused static libraries

[evverx]

fuzz-libdwfl and fuzz-libelf have to be linked against libelf and
libdw. The other static libraries just make the fuzz targets
unnecessarily larger. Without those libraries it's also possible to
simplify the build script a bit.

[DavidKorczynski]

See here for a reference on the next steps forward I had in mind: #7395 (comment)

The idea was to add fuzzers for all of the libraries in elfutils and thus I included them with the intentions of converting it to a loop like this down the line but with all the other libraries included. Similar to what we did in net-snmp https://github.com/net-snmp/net-snmp/blob/8e14effb6626bbf5bc344ec17fdf0354b5b9a90d/testing/fuzzing/build-fuzz-tests.sh#L7-L20 where many fuzzers dont need all of the libraries linked in

[DavidKorczynski]

ah - you're too fast for me @evverx :)! Will comment in my PR