configure.in: rb_cv_getcwd_malloc

* configure.in (rb_cv_getcwd_malloc): check if getcwd allocates
  buffer if NULL is given [ruby-core:62072] [Bug #9752]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45615 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-04-18

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45616 b2dd03c8-39d4-4d8f-98ff-823fe69b080e