o sysctl.conf cannot be used to set sysctls that are present in   unloaded kernel modules.  Remove the example linux compat sysctls   because they break if the linux emulator is loaded as a module, rather   than compiled in.  Add a BUGS entry indicating as much.
o sysctl.conf cannot be used to set sysctls that are present in
  unloaded kernel modules.  Remove the example linux compat sysctls
  because they break if the linux emulator is loaded as a module, rather
  than compiled in.  Add a BUGS entry indicating as much.

Reported by:	jack <jack@germanium.xtalwind.net>
MFC after:	3 days

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