merge revision(s) 42223: [Backport #8702]
* lib/mkmf.rb (xsystem): expand environment variable in all macros not expanded with RbConfig. [Bug #8702] * test/mkmf/test_framework.rb (create_framework): replace all $@ not only once.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@42463 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 42223: [Backport #8702]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@42463 b2dd03c8-39d4-4d8f-98ff-823fe69b080e