Add cmn_err() from SysV and Coherent. #91
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SysV and Coherent, instead of panic(), they use cmn_err(), which also supports printing warning messages and notices from the kernel. RetroBSD can also use this function as well. The function has been slightly modified for RetroBSD to remove SysV/Coherent-specific code.
Needed by the newly created cmn_err() and xcmn_err() functions.
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SysV and Coherent (a Unix clone) do not use the panic() function. Instead, they use cmn_err(), which also supports printing warnings from the kernel, notices, and kernel panics. The code has been slightly modified from the original, so it can be built under RetroBSD.