Three spaces for error messages instead of one

[Ileana Dumitrescu]

Hi,

It was reported [1] that error messages from a libtool invocation have
additional spaces after the package name before the error message. After
looking into this, it seems that gnulib-modules/bootstrap is the cause.

Here is an example:
libtool:   error: only absolute run-paths are allowed

Here is the relevant code in bootstrap:
```
# func_error ARG...
# -----------------
# Echo program name prefixed message to standard error.
func_error ()
{
    $debug_cmd

    $require_term_colors

    func_echo_infix_1 "  $tc_standout${tc_red}error$tc_reset" "$*" >&2
}


# func_fatal_error ARG...
# -----------------------
# Echo program name prefixed message to standard error, and exit.
func_fatal_error ()
{
    $debug_cmd

    func_error "$*"
    exit $EXIT_FAILURE
}
```

Is there a reason for the extra spacing, or could this be changed?

[1] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=71595

--
Ileana Dumitrescu

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