gnu: hurd: Build against glibc 2.28.

Version 2.28 of glibc is the first in a long time that fully supports
GNU/Hurd.  This change updates the Hurd and Mach to provide the features
glibc 2.28 expects and adjusts the cross-compilation tool chain for
"i586-pc-gnu".

* gnu/packages/base.scm (glibc/linux): Rename to...
(glibc): ... this.
[propagated-inputs]: Add 'hurd-target?' case.
[arguments]: Use '--disable-werror' when 'hurd-target?'.  Add
'augment-libc.so' phase when 'hurd-target?'.
[native-inputs]: Add MIG and PERL when 'hurd-target?'.
(glibc/hurd, glibc-for-target): Remove
(glibc/hurd-headers): Inherit from GLIBC, not GLIBC/HURD.
[arguments]: Remove "--enable-obsolete-rpc" configure flag and
'patch-configure-script' phase.
* gnu/packages/cross-base.scm (cross-kernel-headers)[xglibc/hurd-headers]:
Move 'set-cross-headers-path' after 'unpack'.
* gnu/packages/cross-base.scm (cross-libc)[cross-libc-for-target]:
Remove.
Pass "--disable-werror" when TARGET matches 'hurd-triplet?'.
* gnu/packages/hurd.scm (hurd-target?, patch-url): New procedures.
(gnumach-headers)[source](patches, modules, snippet): New fields.
(hurd-headers): Use Git commit 98b3390.
[native-inputs]: Add AUTOCONF and AUTOMAKE.
[arguments]: Add "ac_cv_func_*" configure flags.
(hurd-minimal)[native-inputs]: Remove.
[arguments]: In 'build' phase, build "include/assert-backtrace.h"
first.

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