bug#52411: [core-updates-frozen] kmod-29 build fails, cross-compiled for i586-pc-gnu

[Maxim Cournoyer <maxim.cournoyer@gmail.com>]

Hello Guix!

I haven't been able to deploy core-updates-frozen on one of my machine,
because it has the childhurd service which needs kmod-29 which fails
building, like so:

--8<---------------cut here---------------start------------->8---
config.status: executing libtool commands

        kmod 29
        =======

        prefix:                 /gnu/store/nw7xs4vv55i2w0yhpb2adq0fghzs7dcw-kmod-29
        sysconfdir:             ${prefix}/etc
        libdir:                 ${exec_prefix}/lib
        rootlibdir:             ${exec_prefix}/lib
        includedir:             ${prefix}/include
        bindir:                 ${exec_prefix}/bin
        Bash completions dir:   ${datarootdir}/bash-completion/completions

        compiler:               i586-pc-gnu-gcc
        cflags:                  -pipe -DANOTHER_BRICK_IN_THE -Wall -W -Wextra -Wno-inline -Wvla -Wundef -Wformat=2 -Wlogical-op -Wsign-compare -Wmissing-include-dirs -Wold-style-definition -Wpointer-arith -Winit-self -Wdeclaration-after-statement -Wfloat-equal -Wmissing-prototypes -Wstrict-prototypes -Wredundant-decls -Wmissing-declarations -Wmissing-noreturn -Wshadow -Wendif-labels -Wstrict-aliasing=3 -Wwrite-strings -Wno-long-long -Wno-overlength-strings -Wno-unused-parameter -Wno-missing-field-initializers -Wno-unused-result -Wnested-externs -Wchar-subscripts -Wtype-limits -Wuninitialized -fno-common -fdiagnostics-show-option -fvisibility=hidden -ffunction-sections -fdata-sections -g -O2
        ldflags:                 -Wl,--as-needed -Wl,--no-undefined -Wl,--gc-sections 

        experimental features:  no
        tools:                  yes
        python bindings:        no
        logging:                yes
        compression:            zstd=yes  xz=yes  zlib=yes
        debug:                  no
        coverage:               no
        doc:
        man:                    yes
        test-modules:           no

        features:               +ZSTD +XZ +ZLIB -LIBCRYPTO -EXPERIMENTAL

phase `configure' succeeded after 3.0 seconds
starting phase `patch-generated-file-shebangs'
phase `patch-generated-file-shebangs' succeeded after 0.0 seconds
starting phase `build'
Makefile:2516: warning: overriding recipe for target '.log'
Makefile:2509: warning: ignoring old recipe for target '.log'
Makefile:2530: warning: overriding recipe for target '.log'
Makefile:2516: warning: ignoring old recipe for target '.log'
make --no-print-directory all-recursive
Makefile:2516: warning: overriding recipe for target '.log'
Makefile:2509: warning: ignoring old recipe for target '.log'
Makefile:2530: warning: overriding recipe for target '.log'
Makefile:2516: warning: ignoring old recipe for target '.log'
Making all in .
Makefile:2516: warning: overriding recipe for target '.log'
Makefile:2509: warning: ignoring old recipe for target '.log'
Makefile:2530: warning: overriding recipe for target '.log'
Makefile:2516: warning: ignoring old recipe for target '.log'
  GEN      libkmod/libkmod.pc
  CC       tools/kmod.o
  CC       tools/lsmod.o
  CC       tools/rmmod.o
  CC       tools/insmod.o
  CC       tools/modinfo.o
  CC       tools/modprobe.o
  CC       tools/depmod.o
  CC       tools/log.o
  CC       tools/static-nodes.o
  CC       shared/array.lo
  CC       shared/hash.lo
  CC       shared/scratchbuf.lo
  CC       shared/strbuf.lo
  CC       shared/util.lo
  CC       libkmod/libkmod.lo
  CC       libkmod/libkmod-builtin.lo
  CC       libkmod/libkmod-list.lo
  CC       libkmod/libkmod-config.lo
  CC       libkmod/libkmod-index.lo
  CC       libkmod/libkmod-module.lo
  CC       libkmod/libkmod-elf.lo
  CC       libkmod/libkmod-file.lo
  CC       libkmod/libkmod-signature.lo
In file included from tools/kmod.c:26:
./shared/util.h:24:56: error: ‘PATH_MAX’ undeclared here (not in a function)
   24 | int alias_normalize(const char *alias, char buf[static PATH_MAX], size_t *len) _must_check_ __attribute__((nonnull(1,2)));
      |                                                        ^~~~~~~~
In file included from tools/insmod.c:26:
./shared/util.h:24:56: error: ‘PATH_MAX’ undeclared here (not in a function)
   24 | int alias_normalize(const char *alias, char buf[static PATH_MAX], size_t *len) _must_check_ __attribute__((nonnull(1,2)));
      |                                                        ^~~~~~~~
‘
./shared/util.h:24: confused by earlier errors, bailing out
‘
./shared/util.h:24: confused by earlier errors, bailing out
In file included from tools/modinfo.c:30:
./shared/util.h:24:56: error: ‘PATH_MAX’ undeclared here (not in a function)
   24 | int alias_normalize(const char *alias, char buf[static PATH_MAX], size_t *len) _must_check_ __attribute__((nonnull(1,2)));
      |                                                        ^~~~~~~~
‘
./shared/util.h:24: confused by earlier errors, bailing out
--8<---------------cut here---------------end--------------->8---

Thanks,

Maxim