media-gfx/meshlab: remove various totally erroneous dependencies

mpir:
    mpir is an ancient fork of gmp from 2017. It claims to be focused on
    speed. It doesn't build with modern compilers due to Modern C issues,
    and it fails to build with LTO as well. Unlike gmp, this will never be
    fixed.

    meshlab can look for either mpir or gmp, but we depended on BOTH and
    only gmp got used. mpir was completely extraneous.

levmar:
    It would be great if we could use the system levmar, as meshlab
    genuinely depends on it. But it hardcodes a vendored copy:
    https://github.com/cnr-isti-vclab/meshlab/blob/bd88167db9839109487f401be50991c4bc990d27/src/external/levmar.cmake

qhull:
    Currently, the build logs this:
    -- Could NOT find Qhull: missing: libqhull (found /usr/lib64/cmake/Qhull/QhullConfig.cmake (found version "8.0.2"))

    This happens because cmake is broken, probably. But meshlab 2021
    ports to libqhull_r, which "should" work fine. Pity we are stuck in
    2020 instead.

    We really could and should use the system copy but the build system
    cannot and does not detect it, which means we shouldn't be depending
    on something we cannot use.

Bug: https://bugs.gentoo.org/905859
Bug: https://bugs.gentoo.org/812950
Signed-off-by: Eli Schwartz <eschwartz93@gmail.com>
Signed-off-by: Sam James <sam@gentoo.org>

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