build/meson: fix meson build for shared files
The files in shared/nm-utils are not compiled as one static library, instead each subproject that needs (parts of) them, re-compiles the files individually. The major reason for that is, because we might have different compile flags, depending on whether we build libnm-core or libnm-util/libnm-glib. Actually, I think that is not really the case, and maybe this should be refactored, to indeed build them all as a static library first. Anyway, libnm-util, libnm-glib, clients' common lib, they all need a different set of shared files that they should compile. Refactor "shared/meson.build" to account for that and handle it like autotools does. Another change is, that "shared_c_siphash_dep" no longer advertises "include_directories: include_directories('c-siphash/src')". We don't put c-siphash.h into the include search path. Users who need it, should include it via "#include <c-siphash/src/c-siphash.h>". The only exception is when building shared_n_acd library, which is not under our control.
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