* random.c (fast_random_poll): Only use times() if we HAVE_TIMES.
* sha512.c, tiger.c: Use the U64_C() macro to specify 64-bit constants.
U64_C is defined in include/types.h and uses the correct suffix depending
on the underlying type of u64.
* idea-stub.c (load_module): Catch an error if the idea module file is
unloadable for some reason (unreadable, bad permissions, etc.)
* md.c (string_to_digest_algo): Give a warning about TIGER192 not being
part of OpenPGP.