Handle WM_ACTIVATEAPP message under WIN32, using GetAsyncKeyState() for

all of the key and button states in FLTK.

SunOS 4.x changes (check for <sys/stdtypes.h> and don't rely on
realloc(NULL, size) working - this doesn't work on a lot of platforms!)

Fix nesting of #ifdefs in vsnprintf.c - the C++ wrapper stuff wasn't
being included outside the checks for the individual functions...


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.0@1444 ea41ed52-d2ee-0310-a9c1-e6b18d33e121