Fail to cross build

[Bastien Roucariès]

>From debian:

https://lists.debian.org/debian-cross/2023/11/msg00000.html

Hello,

While cross-building hurd-amd64 from linux, I got a subtle issue with
bash, that was leading to perl FTBFS very oddly.

The issue essentially was in bash/builtins/Makefile.in:

pipesize.h:     psize.aux
        $(SHELL) $(srcdir)/psize.sh > $@

where bash/builtins/psize.sh is a shell script that detects at runtime
what the size of pipes is. The cross-build thus ends up taking the Linux
(build OS) value rather than the Hurd (host OS) value, or a fallback
value (512 in the script when it doesn't manage to work out the value).

Since rebuilding bash natively was easy enough, I just did that and
didn't try to submit a proper report. Here just letting d-cross know
about it.

Samuel

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