OpenZFS 2.3.0-rc1 and uClibc. uClibc does not implement strerror_l.

[jlsalvador]

System information

Type	Version/Name
Distribution Name	Buildroot
Distribution Version	master
Kernel Version	5.15.35
Architecture	x86_64/aarch64
OpenZFS Version	2.3.0-rc1

Describe the problem you're observing

strerror_l() is not implemented in some C libraries, such as uClibc.

Could you provide a fallback (strerror(errnum))?
401c356

Describe how to reproduce the problem

Try to compile openzfs-2.3.0-rc1 with uclibc.

Include any warning/errors/backtraces from the system logs

[...]
copying selected object files to avoid basename conflicts...
  CCLD     libzutil.la
  CCLD     libzfs_core.la
  CCLD     libuutil.la
  CCLD     tests/zfs-tests/cmd/edonr_test
  CCLD     tests/zfs-tests/cmd/skein_test
  CCLD     tests/zfs-tests/cmd/sha2_test
  CCLD     tests/zfs-tests/cmd/blake3_test
  CCLD     tests/zfs-tests/cmd/idmap_util
libtool: warning: '/tmp/tmp.9FNqAnU8oG/TestZfsUclibc/host/bin/../x86_64-buildroot-linux-uclibc/sysroot/usr/lib/libtirpc.la' seems to be moved
libtool: warning: '/tmp/tmp.9FNqAnU8oG/TestZfsUclibc/host/bin/../x86_64-buildroot-linux-uclibc/sysroot/usr/lib/libtirpc.la' seems to be moved
/tmp/tmp.9FNqAnU8oG/TestZfsUclibc/host/opt/ext-toolchain/bin/../lib/gcc/x86_64-buildroot-linux-uclibc/13.3.0/../../../../x86_64-buildroot-linux-uclibc/bin/ld: ./.libs/libspl.a(libspl_la-getmntany.o): in function `getextmntent':
getmntany.c:(.text+0x284): undefined reference to `strerror_l'
collect2: error: ld returned 1 exit status
make[4]: *** [Makefile:6175: libzfs_core.la] Error 1
make[4]: *** Waiting for unfinished jobs....
/tmp/tmp.9FNqAnU8oG/TestZfsUclibc/host/opt/ext-toolchain/bin/../lib/gcc/x86_64-buildroot-linux-uclibc/13.3.0/../../../../x86_64-buildroot-linux-uclibc/bin/ld: ./.libs/libspl.a(libspl_la-getmntany.o): in function `getextmntent':
getmntany.c:(.text+0x284): undefined reference to `strerror_l'
collect2: error: ld returned 1 exit status
make[4]: *** [Makefile:6014: libuutil.la] Error 1
make[3]: *** [Makefile:12579: all-recursive] Error 1
make[2]: *** [Makefile:4752: all] Error 2
make[1]: *** [package/pkg-generic.mk:289: /tmp/tmp.9FNqAnU8oG/TestZfsUclibc/build/zfs-2.3.0-rc1/.stamp_built] Error 2
make: *** [Makefile:23: _all] Error 2
E14:00:25 TestZfsUclibc                            Building

======================================================================
ERROR: test_run (tests.package.test_zfs.TestZfsUclibc.test_run)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/jlsalvador/src/simplek8s-buildroot/buildroot/support/testing/infra/basetest.py", line 74, in setUp
    self.b.build()
  File "/home/jlsalvador/src/simplek8s-buildroot/buildroot/support/testing/infra/builder.py", line 105, in build
    raise SystemError("Build failed")
SystemError: Build failed

----------------------------------------------------------------------
Ran 1 test in 339.195s

FAILED (errors=1)