meson x86 cross: add pkg_config_libdir
With meson 0.54, this seems to be necessary to get meson to use m32 pkgconfig (at least on Arch Linux), the env var seems to be ignored when it configures the build.
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With meson 0.54, this seems to be necessary to get meson to use m32 pkgconfig (at least on Arch Linux), the env var seems to be ignored when it configures the build.