gst/goom/: Fix build with MSVC: include glib.h to define inline appropriately, use header guards where needed.

Original commit message from CVS:
* gst/goom/convolve_fx.c:
* gst/goom/filters.c:
* gst/goom/goom_config.h:
* gst/goom/goom_core.c:
* gst/goom/goom_tools.h:
Fix build with MSVC: include glib.h to define inline appropriately,
use header guards where needed.
* gst/udp/gstudpnetutils.c:
* gst/udp/gstudpsrc.c:
Fix build with MSVC: use WSA* constants/functions where appropriate, use
g_snprintf rather than snprintf.
Fixes #544433.