merge revision(s) 55434: [Backport #12401]
* common.mk (build-ext), ext/extmk.rb: use variable EXTENCS different than ENCOBJS, to get rid of circular dependency. build libencs when linking encodings statically. [ruby-core:75618] [Bug #12401]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@55931 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 55434: [Backport #12401]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@55931 b2dd03c8-39d4-4d8f-98ff-823fe69b080e