common/m4/gst-error.m4: Disable warning of statement not reached on Forte.

common/m4/gst-error.m4: Disable warning of statement not reached on Forte.

Original commit message from CVS:
2006-10-09  Zaheer Abbas Merali  <zaheerabbas at merali dot org>

Patch by: Josep Torre Valles <josep@fluendo.com>

* common/m4/gst-error.m4:
Disable warning of statement not reached on Forte.
* gst/gstmessage.h:
Fix warning on Forte (value doesn't fit on enumeration).
* libs/gst/base/gstbasesink.c: (gst_base_sink_chain_unlocked):
Fix warning on Forte (value doesn't fit on enumeration).
* libs/gst/net/gstnetclientclock.c: (gst_net_client_clock_thread):
DEBUG macro says it takes minimum of 2 args and so Forte
complains about the use with just 1 arg.
* plugins/elements/gstfdsink.c:
* plugins/elements/gstfdsrc.c:
* plugins/elements/gstfilesink.c:
* plugins/elements/gstfilesrc.c:
Use correct return type for the uri handler implementations.

All these fix warnings in Forte.  Fixes bug #360860.