pax-utils: fix cross-compilation (missing native C compiler)
pax-utils: fix cross-compilation (missing native C compiler)

Without the change cross-compilation fails as:

    $ nix build -f. pkgsCross.ppc64.pax-utils -L
    ...
    meson.build:149:2: ERROR: Tried to access compiler for language "c", not specified for build machine.

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