Using initializer list.

Not necessary, GLib will pick up the updated GPollFD automatically.

.. instead of calling g_main_loop_quit(), which may dead-lock.

This reverts commit f53dadcc, to
prepare for a better solution.

It seems that it is not safe to remove the item from std::list
while it's being iterated somewhere else.

This is a very simple quick fix to make things work
until some better solution is implemented.

Pipes aren't really pollable on Windows.
GLib emulates polling on pipes using separate reader/writer threads.
This adds significant overhead and keeps a strong dependency on GLib.

socketpair() function is absent on Windows as well.
We implement it here in a loose way.

This change fixes two issues:

1) console_handler is called from a separate thread.
   Thread-safe primitive is required for correct operation.

2) If console_handler returns TRUE our process is immediately terminated.
   We use Sleep() to give main thread an opportunity to shutdown correctly.

Use CRITICAL_SECTION and CONDITION_VARIABLE.  This requires Windows
Vista or newer.  It fixes problems with GLib threading objects that
were implicitly created by static constructors before g_thread_init().

Work around a build failure due to windows.h macro.

We're going to use Vista features soon.  Sorry for those poor people
still on XP (or Windows, anyway).

This patch also adds extern "C" { } wrapper around string_util.h
to allow its usage in C++ code