merge revision(s) r45378: [Backport #9658] [Backport #9866]

	* configure.in: Fix a build problem with clang and --with-opt-dir.
	  If ruby is configured with --with-opt-dir=dir when using clang
	  as compiler, a warning `clang: warning: argument unused during
	  compilation: '-I dir'` is emitted almost every time clang
	  compiles a file.  Unfortunately, RUBY_CHECK_PRINTF_PREFIX takes
	  any output from the compiler as fatal error, and the check thus
	  fails due to the warning.  This is an attempt to fix the problem
	  by adding a flag -Qunused-arguments to CFLAGS locally in the
	  function to suppress the warning. [ruby-dev:48062] [Bug #9658]
	  [Fixes GH-571] https://github.com/ruby/ruby/pull/571


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@46402 b2dd03c8-39d4-4d8f-98ff-823fe69b080e