Etags: yet another improvement in Ruby tags

Etags: yet another improvement in Ruby tags

* lib-src/etags.c (Ruby_functions): Handle continuation lines in
Ruby accessor definitions.  (Bug#22241)

* test/etags/ruby-src/test1.ru (A::B#X): Add some more tests for
accessors and multiline definitions.
* test/etags/ETAGS.good_1:
* test/etags/ETAGS.good_2:
* test/etags/ETAGS.good_3:
* test/etags/ETAGS.good_4:
* test/etags/ETAGS.good_5:
* test/etags/ETAGS.good_6:
* test/etags/CTAGS.good: Adapt to changes in Ruby tags.