Support mercury in 'ctags' as well
The previous lack of support was due to incorrect calls to 'make_tag' in 'mercury_pr', which caused 'pfnote' to refrain from adding Mercury tags to the list of recorded tags. * lib-src/etags.c (mercury_pr): Pass the correct NAME and NAMELEN arguments to 'make_tag'. * test/manual/etags/CTAGS.good: Adjust to the above change.
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