We don't want to waste bandwidth on the lossless refresh if we might
need that bandwidth for a normal update. Try to estimate how much
data we can safely send without interfering.

Make sure the code deals more gracefully with timers that take a
long time to execute, and therefore might miss their deadlines.

mingw has a perfectly functional gettimeofday() so use that instead
of having multiple copies of our own version.

It just adds noise and you can't really tell which timer it is
anyway without more logging in other places.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4059 3789f03b-4d11-0410-bbf8-ca57d06f2519

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@589 3789f03b-4d11-0410-bbf8-ca57d06f2519

build successfully, e.g. LynxOS 2.3 does not have snprintf().


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@571 3789f03b-4d11-0410-bbf8-ca57d06f2519

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/branches/merge-with-vnc-4.1.1@524 3789f03b-4d11-0410-bbf8-ca57d06f2519