build: create intermediate libraries of shared/nm-utils
Previously we would compile source files from shared/nm-utils multiple times. That not only slows down compilation, but it makes it confusing which project require exactly what. Most of the files in shared/nm-utils are a mixed bag of utility functions. Just build one libnm-utils-base library. Since the linker will throw away unused parts, there is no problem that not every user of libnm-utils-base needs everything. Also add libnm-utils-udev, which cannot be part of libnm-utils-base as it has an additional dependency on libudev.
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