Fix a couple of missing includes for MSVC2005 and a C99 issue. Also, starting with...

Fix a couple of missing includes for MSVC2005 and a C99 issue. Also, starting with 2.14.0, GLib won't provide a pipe(...

Original commit message from CVS:
Patch by: Ole André Vadla Ravnås  <ole.andre.ravnas@tandberg.com>
* gst/gsttrace.c:
* libs/gst/net/gstnetclientclock.c: (gst_net_client_clock_new):
* libs/gst/net/gstnettimepacket.c: (gst_net_time_packet_send):
* libs/gst/net/gstnettimeprovider.c: (gst_net_time_provider_new):
Fix a couple of missing includes for MSVC2005 and a C99 issue. Also,
starting with 2.14.0, GLib won't provide a pipe() macro any longer,
so use _pipe() directly (#492077).
* win32/common/dirent.c: (_treaddir):
Add a couple of casts to make it build without warnings with MSVC.
* win32/common/libgstreamer.def:
Add some more symbols that need to be exported.