merge revision(s) 39267,39273,39294,39298,39313:

	* configure.in: unexpand arch sitearch and exec_prefix values, so
	  directly specified bindir, libdir, rubyprefix, etc can be properly
	  substituted.  [ruby-core:52296] [Bug #7860]

	* configure.in (shvar_to_cpp): do not substitute exec_prefix itself
	  with RUBY_EXEC_PREFIX, which cause recursive definition.
	  [ruby-core:52296] [Bug #7860]

	* configure.in (unexpand_shvar): regularize a shell variable by
	  unexpanding shell variables in it.

	* configure.in (unexpand_shvar): regularize a shell variable by
	  unexpanding shell variables in it.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39320 b2dd03c8-39d4-4d8f-98ff-823fe69b080e