depfixer: silence fix_jar() and make it do something

fix_jar() tries to remove an existing Class-Path entry from the jar
manifest by postprocessing the manifest and passing it to `jar -um`.
However, `jar -um` can only add/replace manifest entries, not remove
them, and it also complains loudly when replacing an entry:

    Dec 13, 2022 7:11:19 PM java.util.jar.Attributes read
    WARNING: Duplicate name in Manifest: Manifest-Version.
    Ensure that the manifest does not have duplicate entries, and
    that blank lines separate individual sections in both your
    manifest and in the META-INF/MANIFEST.MF entry in the jar file.

Thus fix_jar() produces one such warning for each entry in the manifest
and accomplishes nothing else.

Use jar -uM instead.  This completely removes the manifest from the jar
and allows adding it back as a normal zip member, fixing fix_jar() and
avoiding the warnings.

Fixes: https://github.com/mesonbuild/meson/issues/10491
Fixes: c70a051e93 ("java: remove manifest classpath from installed jar")

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