Only define WINVER if it isn't already defined. (dm)


git-svn-id: svn://mielke.cc/main/brltty@7841 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Get async events to work on Windows. (dm)


git-svn-id: svn://mielke.cc/main/brltty@7842 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Add asyncCallFunction(). (dm)


git-svn-id: svn://mielke.cc/main/brltty@7843 91a5dbb7-01b9-0310-9b5f-b28072856b6e
Make asyncCallFunction() memory-safe if it times out. (dm)


git-svn-id: svn://mielke.cc/main/brltty@7844 91a5dbb7-01b9-0310-9b5f-b28072856b6e
asyncCallFunction() shouldn't wait as it isn't thread-safe. (dm)


git-svn-id: svn://mielke.cc/main/brltty@7845 91a5dbb7-01b9-0310-9b5f-b28072856b6e