describe the reason to check mblen().

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40443 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2013-04-24 13:22:27 +00:00 · 2013-04-24 13:22:27 +00:00 · 66ad210df8
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 Wed Apr 24 21:51:13 2013  Tanaka Akira  <akr@fsij.org>

 	* configure.in: Check mblen().
+	  mblen() is optional in uClibc.

 	* eval_intern.h (CharNext): Don't use mblen() is not available.