patchSort howto documents in howto-index.txt

> Howto documents in howto-index.txt were listed in a rather
> random order. So better sort them.
>
> Signed-off-by: Thomas Ackermann <th.acker@arcor.de>
> ---

>  Documentation/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/Documentation/Makefile b/Documentation/Makefile
> index d7417b8..ff8ad9a 100644
> --- a/Documentation/Makefile
> +++ b/Documentation/Makefile
> @@ -348,7 +348,7 @@ $(patsubst %.txt,%.texi,$(MAN_TXT)): %.texi : %.xml
>  
>  howto-index.txt: howto-index.sh $(wildcard howto/*.txt)
>  	$(QUIET_GEN)$(RM) $@+ $@ && \
> -	'$(SHELL_PATH_SQ)' ./howto-index.sh $(wildcard howto/*.txt) >$@+ && \
> +	'$(SHELL_PATH_SQ)' ./howto-index.sh $(sort $(wildcard howto/*.txt)) >$@+ && \
>  	mv $@+ $@
>  
>  $(patsubst %,%.html,$(ARTICLES)) : %.html : %.txt

> 
> I think $(wildcard) used to sort but in recent GNU make it no longer
> does, so this is probably a good change.
> 
> Do we need to explicitly sort the api-index as well?  $(API_DOCS) is
> fed to the script that reads filenames one at a time in the given
> order, but I do not see anybody asking for a sorted list while
> producing that list.  The result looks to be sorted in my build
> farm with GNU make 3.82, but that could be by accident.
>