autoconf: Fail when __copy_from_user_inatomic is a non-GPL symbol
A followup to 849c14e04844a2f0e1f7e42886c2cef083563f35
Fix https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1009242
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: szubersk <szuberskidamian@gmail.com>
Closes #13389