gnu: add bootstrap support for mips64el-linux using the MIPS N32 ABI.
* .gitignore: Add entry for bootstrap/mips64el-linux/guile-2.0.9.tar.xz.
* gnu-system.am (bootstrap_mips64el_linuxdir,
dist_bootstrap_mips64el_linux_DATA, nodist_bootstrap_mips64el_linux_DATA):
New variables.
(DISTCLEANFILES): Add $(nodist_bootstrap_mips64el_linux_DATA).
(gnu/packages/bootstrap/mips64el-linux/guile-2.0.9.tar.xz): New target.
* build-aux/download.scm (file-name->uri): Adapt to the newer mips64el-linux
bootstrap tarballs.
* gnu/packages/bootstrap.scm (%bootstrap-guile, %bootstrap-coreutils&co,
%bootstrap-binutils, %bootstrap-glibc, %bootstrap-gcc): Adapt to the newer
mips64el-linux bootstrap tarballs.
* gnu/packages/bootstrap/mips64el-linux/bash:
* gnu/packages/bootstrap/mips64el-linux/mkdir:
* gnu/packages/bootstrap/mips64el-linux/tar:
* gnu/packages/bootstrap/mips64el-linux/xz: New files.
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