kmod: upgrade 30 -> 31

kmod: upgrade 30 -> 31

Changelog:
===========
- Improvements

  - Allow passing a path to modprobe so the module is loaded from
    anywhere from the filesystem, but still handling the module
    dependencies recorded in the indexes.
  - Use in-kernel decompression if available.
  - Make modprobe fallback to syslog when stderr is not available, as was
    documented in the man page, but not implemented
  - Better explaing `modprobe -r` and how it differentiates from rmmod
  - depmod learned a `-o <dir>` option to allow using a separate output
    directory.
  - Add compat with glibc >= 2.32.9000 that dropped __xstat
  - Improve testsuite to stop skipping tests when sysconfdir is something
    other than /etc
  - Build system improvements and updates
  - Change a few return codes from -ENOENT to -ENODATA to avoid confusing output
    in depmod when the module itself lacks a particular ELF section due to e.g.
    CONFIG_MODVERSIONS=n in the kernel.

- Bug Fixes

  - Fix testsuite using uninitialized memory when testing module removal
    with --wait
  - Fix testsuite not correctly overriding the stat syscall on 32-bit
    platforms. For most architectures this was harmless, but for MIPS it
    was causing some tests to fail.
  - Fix handling unknown signature algorithm
  - Fix linking with a static liblzma, libzstd or zlib
  - Fix memory leak when removing module holders
  - Fix out-of-bounds access when using very long paths as argument to rmmod
  - Fix warnings reported by UBSan

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>