build: make lint-ci work properly on Linux make

I want to ditch the FreeBSD 10 machines from running node-test-lint and just get the jenkins-workspace machines to do it. Unfortunately it doesn't work because it seems we're using a quirk of gmake that ships with FreeBSD 10.

$(wildcard test/addons/??_*/*.cc test/addons/??_*/*.h) is executed when Makefile is loaded, and before the body of lint-addon-docs is executed. So in a pristine clone it expands to nothing, since those files are created by test/addons/.docbuildstamp which is a direct dependency of lint-addon-docs (it'd probably be OK if that was done before the call to $(MAKE) lint-addon-docs but then make lint-addon-docs as a stand-alone wouldn't work).

/cc @bnoordhuis who last tried to touch this stuff when attempting a refactor in d9b59def which was subsequently reverted /cc @joyeecheung who introduced part of this functionality in #16377 and may have more of a clue than me about why this only seems to work on the FreeBSD 10 linter hosts