Add IfModule mod_rewrite.c to misc/advanced.htaccess
The introduction package creates its own .htaccess file which contains <IfModule mod_rewrite.c>.
I would like to have that IfModule in misc/advanced.htaccess so that the introduction package could ship with our misc/advanced.htaccess, instead of creating its own .htaccess file.
The usage of misc/advanced.htaccess will be then added to the intro-package packaging script.
I would like to commit this also for 4.4, so that we can also use this in the 4.4 introduction packaging script.
(issue imported from #M16075)