[RFA] Constify m88k support.

[Klee Dienes]

Apparently that warning in my previous (withdrawn) RFA was trying to 
tell me something; the m88k code uses fields in the opcode vector to 
store a hash-table pointer.  I factored out the hash-table code into a 
separate xmalloc'd table that contains pointers to the const opcode 
vector.  I also moved the table out of the header file and into the .c 
file.  Finally, I fixed a bug that was causing the initialization code 
to be called repeatedy with each call to m88kdis.

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