File _multibuild of Package glibc

<multibuild>
  <package>i686</package>
  <package>utils</package>
  <package>testsuite</package>
  <package>cross-aarch64</package>
  <package>cross-ppc64le</package>
  <package>cross-riscv64</package>
  <package>cross-s390x</package>
</multibuild>