build: fix distcheck when building settings specification XML
The generated settings-spec.xml should not be DIST-ed because it's regenerated every time libnm-util changes. That meants it gets rebuilt during 'make' even from a dist tarball. Thus, it shouldn't be part of the dist tarball itself. In addition, settings-spec.html shouldn't be included in $(content_files) becuase this is added to EXTRA_DIST by gtk-doc.make. Since generate-settings-spec.c the move from docs/api/ to tools/, this started breaking distcheck even though the original Makefile rules were wrong too.
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