build: clean up and partial synchronisation with upstream

github / cmark-gfm

GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C

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build: clean up and partial synchronisation with upstream #357

Open compnerd opened 6 months ago

compnerd commented 6 months ago

Pull down a number of upstream changes for the build system. Additionally add some inflight changes. This overhaul simplifies the configuration and uses standard build options now e.g. BUILD_SHARED_LIBS, BUILD_TESTING to configure the build as per CMake documentation.