mkmf.rb: TARGET_SO_DIR
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56047 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
mkmf.rb: TARGET_SO_DIR
under $(TARGET_SO_DIR) which is $sodir if it is defined with
$extout. [ruby-core:77058] [Bug #12681]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56047 b2dd03c8-39d4-4d8f-98ff-823fe69b080e