Are the CMSG_SPACE() macros no longer usable to allocate space for various
buffer bits?

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Michael,

I upgraded trebuchet to the latest -current, and now BIND 9 no longer
compiles:

  socket.c:186: variable-size type declared outside of any function

This is because BIND 9 declares a struct field "unsigned char
cmsg[TOTAL_SPACE];", and the definition of TOTAL_SPACE involves the
CMSG_SPACE() macro from <sys/socket.h>.  In 1.4U, CMSG_SPACE() does
not expand to a compile-time constant but to an expression involving a
function call, making it unsuitable for use as an array size.

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