Resend 2: Honor --disable-debug or --disable-trace completely

[Vincent Béron]

Use a less intrusive way to actually remove the TRACEs, FIXMEs and WARNs
if --disable-trace or --disable-debug is specified.

I would have preferred to have DEFS do this, but it looks like it's
always set to -DHAVE_CONFIG_H towards the end of configure, so I'm stuck
to use another var for that. The name is probably not the best as I
intend to use it for _WIN64 definition also in the near future.

Changelog:
Use a new MSGSDEFS variable in configure/Makefiles to actually remove
all the debug messages (minus ERRs) if the user decides so.

Vincent
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