* test/ruby/test_m17n_comb.rb (test_str_crypt): Use Etc.confstr to
  detect the glibc version.
  libc.so is not an executable on Debian GNU/kFreeBSD 7.0 (wheezy).



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45996 b2dd03c8-39d4-4d8f-98ff-823fe69b080e