bug#23349: Compile output shall be error output

[Jean Louis]

When editing a guile file and running it, it is going to compile it, and
there are warnings:

;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
;;;       or pass the --no-auto-compile argument to disable.
;;; compiling /home/data1/protected/bin/webm2html
;;; compiled
;;;       
/home/data1/protected/.cache/guile/ccache/2.0-LE-8-2.0/home/data1/protected/bin/webm2html.g\
o

This kind of warnings is not desired in the output of the command and
warning shall be given on the error output and not on standard output,
so that it is possible, just with any other programs to redirect the
warnings to dev null, for example: myguile.scm 2 > /dev/null, to avoid
such warnings.

This does not work as warnings are given on standard output.

Jean Louis