These are supported by gcc and clang, and I don't think MSVC works well
with our code anyway, so let's keep things simple and use these
directly.

Major restructuring of how streams work. Neither input nor output
streams are now blocking. This avoids stalling the rest of the client or
server when a peer is slow or unresponsive.

Note that this puts an extra burden on users of streams to make sure
they are allowed to do their work once the underlying transports are
ready (e.g. monitoring fds).

Created a new subclass of Exception called GAIException() that will
handle error messages from getaddrinfo() instead of letting Exception()
handle it. GAIException() will make use of gai_strerror() to map the
error code to text. On Windows, gai_strerrorW() must be used if the text
is encoded with UTF-8.

Include the type of exception in the string generated by each
subclass. Also simplify the constructs to what is needed.

This allows the compiler to analyse the format strings and
arguments for correctness.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4044 3789f03b-4d11-0410-bbf8-ca57d06f2519

number of arguments.

[Bugfix] Minor compilation fixes (missing #includes)


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