gnu: bootstrap: Add support for powerpc64le-linux.

The bootstrap tarballs used by these bootstrap packages were created via the
following steps:

- Create a new x86_64 VM using QEMU.
- Use
  https://ftp.gnu.org/gnu/guix/guix-system-install-1.2.0.x86_64-linux.iso.xz
  to install Guix System 1.2.0 in the VM.
- Run: guix pull --no-substitutes --commit=662e7e28d576ada91fc9dec7d27c100666114f03
- Run: guix build --no-substitutes --target=powerpc64le-linux-gnu bootstrap-tarballs

With the exception of gcc-static, all bootstrap binaries contained in these
tarballs can be built reproducibly.  Unfortunately, gcc-static is not always
reproducible when everything is built from source on separate machines.
Despite investigation efforts, the cause remains unclear, so we have decided
to move forward with these binaries to unblock further bootstrapping work.
For details, see <https://bugs.gnu.org/41669>.

* gnu/packages/bootstrap.scm (%bootstrap-executables)
(bootstrap-executable-file-name, bootstrap-guile-url-path)
(bootstrap-guile-hash, %bootstrap-coreutils&co, %bootstrap-binutils)
(%bootstrap-glibc, %bootstrap-gcc): Add entries for powerpc64le-linux.
(%bootstrap-executable-base-urls): Add an entry for alpha.gnu.org.

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