net: use freeaddrinfo() in _info example.

In fact, almost everyone will want to do this, so include the required
headers in net.h.  This makes usage simpler.

Reported-by: Jeremy Visser <jeremy@visser.name>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
opt/helpers: fix out-of-range check in opt_set_floatval()

opt_set_floatval() uses opt_set_doubleval() to do initial conversion
and bounds checking before casting the result to float.  Previously
the out of bounds check compared the original and float values for
equality and declared anything unequal to be out of bounds. While this
trick works well in the orderly integer world, it can backfire with
floating point. For example, 3.1 resolves to the double more precisely
known as 3.100000000000000088817841970012523233890533447265625, while
3.1f resolves to 3.099999904632568359375.  These are not equal, though
3.1 is generally regarded as being in bounds for a float.  There are
around 8 billion other doubles (i.e. 3.1 +/- a little bit) that map to
the same 3.1f value, of which only one is strictly equal to it.

Why wasn't this discovered by the tests? It turns out that neither
set_floatval nor set_doubleval were tested against non-integral
numbers.  This is slightly improved here.

This patch uses the arguably more reasonable definition of bounds that
is found in opt_set_doubleval(): it excludes numbers that would get
rounded to zero or an infinity. One subtlety is that the double
version allows `--foo=INF` for an explicit infinity without overflow.
This is possibly useful, and there is some fiddling to allow this for
floats. Likewise an explicit zero is allowed, as you would expect.

It is perhaps worth noting that the `*f = d` cast/assignment at the
heart of it all can crash and core dump on overflow or underflow if
the floating point exception flags are in an unexpected state.

Signed-off-by: Douglas Bagnall <douglas@halo.gen.nz>
configurator: add BUILTIN_CTZ*, BUILTIN_FFS, and ICCARM_INTRINSICS

Realistically, the ICCARM_INTRINSICS probably won't ever be generated
by configurator, but will show up in manually created or alternately
generated config.h's.

Signed-off-by: Cody P Schafer <dev@codyps.com>