Sometimes when troubleshooting in other languages I might change a
sprintf format to be static, usually to help rule out whatever issue I
might be trying to track down.

For example I might change:
  Sbuf sprintfk "this %s work", ktest==1 ? "does" : "doesn't"
to:
  Sbuf sprintfk "this s work" ;, ktest==1 ? "does" : "doesn't"

It seems csound doesn't like this, and complains with:
error:  Unable to find opcode entry for 'sprintfk' with matching argument types:
Found: S sprintfk S

I know this basically turns sprintfk into strcpyk, but it seems like a
trivial change that could add a little flexibility.  I only tested
with sprintfk, but I assume the same would apply for printf and
sprintf too.

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