unamed bit fields and other losses on v7 c

[utzoo!decvax!ucbvax!unix-wizards]

>From Lepreau at UTAH-20 Sun Nov 22 09:39:31 1981
Both the v7 & 4.1 versions of pcc support initialized bit fields,
which the Richie compiler does not.  Only the 4.1 compiler supports
signed fields.  HOWEVER, the C reference manual clearly states that

	"implementations are not required to support anything but
	integer [NB 'integer' not 'int'] fields.  Moreover, even
	'int' fields may be considered to be unsigned."

Moral: only use unsigned fields.  Lint catches int's.
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