The new toolchain may (!) have fixed a longstanding bug in LLLeap / APR when
we try to pump large volumes of data through a Windows named pipe using APR
nonblocking I/O. This used to fail pretty consistently because the APR
nonblocking write call would sometimes spuriously return "would block" when in
fact the data buffer was completely written; the caller would later retry,
which of course would duplicate some of the data in the pipe. Preliminary
experiments with VS 2013 suggest this may have been resolved. This changeset
is to propagate the experiment to a wider range of Windows systems; we may
need to revert it if in fact the bug persists.

This only applies to the Windows package so far, because so far only the
Windows package exists.

point to new version of llphysicsextensions (source, not stub) with updated path to second life map file

The contents are extracted, but not yet built into the viewer installer.

The any() builtin was introduced in Python 2.5. Not only is its intent
clearer, but it handles the case of zero items -- which the reduce(or_)
construct does not. Sporadically we've seen exceptions from
generate_breakpad_symbols.py when reduce(or_, ...) is given zero items. This
masks the actual error (failure to dump symbols? failure to read them?),
masquerading as a bug in the Python script.

Restore Unicode path to viewer_manifest script - apparently we use the Unicode version of NSIS, not the one from the NULLSOFT site

Investigative check-in to see if system clock() function can be used to time ms_sleep() calls and adjust expectations accordingly