OpenZFS/src 56871e4config user.m4, include libzutil.h

Fallback to strerror() when strerror_l() isn't available

Some C libraries, such as uClibc, do not provide strerror_l() in
which case we fallback to strerror().

Reviewed-by: Tino Reichardt <milky-zfs at mcmilk.de>
Signed-off-by: Brian Behlendorf <behlendorf1 at llnl.gov>
Closes #16636 
Closes #16640 
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+4-0include/libzutil.h
+1-1config/user.m4
+5-12 files

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