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When using errno in g_set_error with _(), preserve errno. Bug #592457.

Even though we ignore SIGPIPE, gdb will still stop when the process
receives one, which sometimes confuses people into thinking the app
has crashed (eg, bug 578984, bug 590420), and is annoying anyway. So
use MSG_NOSIGNAL if it's there.

http://bugzilla.gnome.org/show_bug.cgi?id=591378

libc caches the contents of resolv.conf, so if it changes (eg, because
the network state changed), we need re-run res_init().

http://bugzilla.gnome.org/show_bug.cgi?id=584246

Includes (untested) fix for win32 that calls SetEvent() in that case.

Part of: Bug 591388 - number of GCancellables available is too limited

Part of: Bug 591388 - number of GCancellables available is too limited

This patch only adds the function. The function is a NOP.
See the API documentation for a rationale.

Part of: Bug 591388 - number of GCancellables available is too limited

Make g_cancellable_make_pollfd() return a gboolean that indicates its error
status. Update the code that calls this function accordingly.

Patch from bug #591532.

Avoid "function declaration isn't a prototype" warnings from gcc 4.4
in the Windows-specific code.

Quoting its NEWS file: "The m4sh macros AS_IF and AS_CASE can now be
used in shell lists.  The responsibility for supplying a trailing
newline now belongs to the call site, but since most users did not add
dnl, this generally results in fewer empty lines in configure."

http://bugzilla.gnome.org/show_bug.cgi?id=591840

This means we don't sync in the case where we created an (empty)
temp file and now replace it with the data.

This fixes (among other things) the performance of trashing files.

Fixes bug #589649.
Signed-off-by: David King <davidk@openismus.com>