Merge branch 'jk/make-tags-find-sources-tweak' into maint

Update the procedure to generate "tags" for developer support. * jk/make-tags-find-sources-tweak: Makefile: exclude contrib from FIND_SOURCE_FILES Makefile: match shell scripts in FIND_SOURCE_FILES Makefile: exclude test cruft from FIND_SOURCE_FILES Makefile: reformat FIND_SOURCE_FILES