[Bug-openmcl] open :element-type

[bryan o'connor]

:element-type is unfairly restricted to ([un]signed-byte 32).

the standard says, "a type specifier for recognizable subtype of
character; or a type specifier for a finite recognizable subtype
of integer; or one of the symbols signed-byte, unsigned-byte, or
:default. The default is character."

(open "tmp.dat" :direction :output
		       :if-exists :supersede
		       :element-type '(unsigned-byte 33))

the restriction seems to be in make-heap-buffer.  removing it
does fix the problem.. but i imagine it's also creating some.

						...bryan