bug#73685: [patch] to silence diagnostic compile messages and welcome message (was GUILE_QUIET)

[Matt Wette]

The attached three patches provide modifications to Guile to provide 
users the ability
to silence compile and loading messages that occur when using Guile 
interactively. In
addition, there is a separate capability added to allow users to silence 
the welcome
message.     The first is performed by using the `-I' command line 
argument, or setting
the (new)  current-info-port to a void-port:
    > (current-info-port (%make-void-port "w"))
The second is performed by, for example, adding the following code to 
the ~/.guile file:
    ((@ (system repl repl) %inhibit-welcome-message) #t)

The three patches are
0001) fix a minor typo in load.c, associated with the procedure 
set-current-output-port
0002) make changes to add and use current-info-port, and the associated 
`-I' command arg
0003) make changes to add and implement the %inhibit-welcome-message 
parameter.

Please consider for merge into the main branch.

Many thanks to Arne Babenhauserhiede for engaging discussions on this 
subject.

Thanks,
Matt

0003-Create-procedure-to-enable-silencing-the-Guile-welco.patch
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0002-Redirect-diagnostice-output-messages-e.g.-auto-compi.patch
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0001-Fix-typo-in-naming-function-set-current-output-port.patch
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