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Document that building from source requires pkg-config

Leo P. Singer requested to merge leo-singer/ligo.skymap:develop-requires-pkg-config into main

When you build ligo.skymap from source but do not have pkg-config installed, the setup.py script does not add the linker flags for GSL. As a result, when you import ligo.skymap, you get this error:

ImportError: ...: undefined symbol: gsl_root_fdfsolver_steffenson

See https://github.com/lpsinger/ligo.skymap/issues/3#issue-485301354.

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