mtrace: init at 2.33-50

`mtrace(1)` is a small Perl script that interprets and provides
human-readable output for `malloc(3)` traces.

Even though this is actually part of `glibc` itself I decided to place
this into its own package. The main reason for this is that this script
has a runtime dependency on Perl which would complicate `stdenv`
bootstrapping since we'd have to compile another Perl that doesn't depend on
the bootstrap tools that is used as runtime dependency for the
stage2 glibc.

Since this is only a dev/debugging tool, splitting this up seemed like a
reasonable choice to me.

On a leaking C program, this can be used like this:

    $ env MALLOC_TRACE=$(pwd)/trace ./a.out
    $ ./result/bin/mtrace ./trace

    Memory not freed:
    -----------------
               Address     Size     Caller
    0x0000000001875690      0x4  at 0x401151

Closes #141924

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