new cdecl to be posted to comp.sources.unix

[Brian Westley]

An updated version of cdecl which understands void, const, volatile,
signed, extern, auto, static, and register (but not noalias, because
NOBODY understand noalias), will be posted to comp.sources.unix
It also allows cdecl to be linked to 'explain', 'declare', and 'cast'
to let you enter queries from your system prompt.
Explain will now explain casts, too.

struct Merlyn_LeRoy *(*(*volatile (*const var)())[3])();