merge revision(s) 44598,44599,44600:

	/usr/lib/libc.so is not symlink on FreeBSD 10

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@44602 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 44601:

	FreeBSD 10 SEGVs this less than 4M + 12K bytes.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@44603 b2dd03c8-39d4-4d8f-98ff-823fe69b080e