gnu: commencement: Add support for a native GNU/Hurd system.
* gnu/packages/commencement.scm (kernel-headers-boot0,
ld-wrapper-boot0, bison-boot0, flex-boot0, gnumach-headers-boot0,
mig-boot0, hurd-headers-boot0, hurd-minimal-boot0,
hurd-kernel-headers-boot0): New variables.
(bison-boot1): Remove.
(%boot1-inputs): Add ld-wrapper-boot0.
(glibc-final-with-bootstrap-bash)[arguments]: Allow libpthread
to find libihash.
[propagated-inputs]: Use kernel-headers-boot0.
[inputs]: Add "mig".
(glibc-final)[arguments]: Use kernel-headers-boot0.
(static-bash-for-glibc, bash-final)[native-inputs]: Use bison-boot0.
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