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* lib/mkmf.rb (try_cppflags, try_cflags, try_ldflags): get rid of interference by modifying global variables in have_devel? method. [ruby-core:67962] [Bug #10821] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@49581 b2dd03c8-39d4-4d8f-98ff-823fe69b080e