build/meson: don't link static library libnm_client_impl with helper

Per convention, we shall no link our static libraries with other static
libraries of our own. The purpose is that we only link static libraries
at the end of each build product (that is, in executables, shared
libraries and shared modules).

src/libnm-client-impl/meson.build

@@ -65,7 +65,6 @@ libnm_client_impl = static_library(
     libudev_dep,
     glib_dep,
   ],
-  link_with: libnm_log_null,
 )
 
 linker_script = join_paths(meson.current_source_dir(), 'libnm.ver')

src/libnm-client-impl/tests/meson.build

@@ -29,6 +29,7 @@ foreach test_unit: test_units
       libnm_base,
       libnm_udev_aux,
       libnm_systemd_shared,
+      libnm_log_null,
       libnm_glib_aux,
       libnm_std_aux,
       libc_siphash,