merge revision(s) 57446: [Backport #13413]
mkmf.rb: fix script installation * lib/mkmf.rb (MakeMakefile): fix condition to install script files.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@59277 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 57446: [Backport #13413]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@59277 b2dd03c8-39d4-4d8f-98ff-823fe69b080e