Use a stricter set of warnings; make them all pass.

configure.in

src/common/crypto.c

src/common/fakepoll.c

src/common/test.h

src/or/connection.c

src/or/dirserv.c

src/or/main.c

src/or/or.h

src/or/relay.c

src/or/routerlist.c

src/or/routerparse.c

src/or/test.c

src/tools/tor-resolve.c