mkmf.rb: header in framework

* lib/mkmf.rb (have_framework): allow header file to check.
  [ruby-core:55745] [Bug #8593]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41777 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-07-05

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41778 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
mkmf.rb: old syntax

* lib/mkmf.rb (have_framework): get rid of newer syntax to run with
  ruby 1.8 for cross compiling.  [ruby-core:55745] [Bug #8593]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41779 b2dd03c8-39d4-4d8f-98ff-823fe69b080e