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The `settings-docs.c` file is generated by processing the `nm-property-docs.xml` file. Although this works in autotools, the `.c` extension makes meson not to handle it properly. Given the fact that it only contains a number of defines it makes sense to change its extension to `.h` an use it as a header. This also makes meson to handle it properly and build it before its used. https://mail.gnome.org/archives/networkmanager-list/2018-January/msg00057.html
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