[m-rev.] for review: Quote documentation generation commands

[Peter Wang]

On Wed, 12 Oct 2016 19:06:59 +0800, Sebastian Godelet <sebastian.godelet at outlook.com> wrote:
> Quote documentation commands for Windows
> 
> doc/Mmakefile:
>     Quote TEXI2DVI, DVIPS, PDFTEX, MAKEINFO commands since they are resolved
>     to absolute path names in configure.ac. This causes problems on Windows
>     since MikTex is by default installed in %ProgramFiles%, which contains
>     spaces on an English Windows version.

Thanks, I've committed it.

Peter