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>