-results_to_stderr problems: size limit, not on linux

_From [bruen...@google.com](https://code.google.com/u/109494838902877177630/) on September 15, 2011 16:15:27_

many users use error results in the output stream to localize error reports. but we have some issues there:

1) no linux support b/c of sideline model: waiting on DRi#445 for that

2) hitting MAX_MSG_LEN=768 in drsym_write_to_console for error reports
=> going to invoke kernel32 WriteFile directly.
already have in a buffer: don't need vsnprintf.

3) on win7 cmd there is no output (plus messes up app output): that's DRi#440 and DRi#364

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=594_