Fix warnings

[Roland McGrath]

> GCC 3.2 and using -Wmissing-prototypes -Wmissing-declarations to find
> such problems.

Ah, well extra warning options are sometimes not in the makefile for a
reason.  I don't think the warnings for failing to have declared a
prototype prior to the prototype definition of a function are really
useful.  The changes you make to suppress those warnings just give us yet
more error-prone duplication to wade through and have to fix up with
duplicate changes forevermore.