merge revision(s) 59454,59954: [Backport #14118]
configure.in: use libtool * configure.in: use libtool on macOS to suppress a warning against debug_counter.o, which has no symbols unless USE_DEBUG_COUNTER is set to non-zero. configure.in: use newer libtool only
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@62636 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 59454,59954: [Backport #14118]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@62636 b2dd03c8-39d4-4d8f-98ff-823fe69b080e