* configure.in: Add #include<sys/stat.h> when struct stat is tested. Otherwise, incomplete type dereference error will occur.
-- We don't only need to change "struct stat.st_size" test, but also need to change "struct stat.st_blocks" test.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30900 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merges r30699 and r30700 from trunk into ruby_1_9_2.¶
--
We don't only need to change "struct stat.st_size" test, but also
need to change "struct stat.st_blocks" test.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30900 b2dd03c8-39d4-4d8f-98ff-823fe69b080e