HACKING.md: explain a bit more about how to build xdgmime for testing
Note that the submodule must be built before configuring the shared-mime-info build, and that xdgmime should be built using its Makefile, not Meson.
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Note that the submodule must be built before configuring the shared-mime-info build, and that xdgmime should be built using its Makefile, not Meson.