[O] Issues when compiling Org master from source in GNU Emacs 25.0.50.1

[Vicente Vera]

Hello

When I started using GNU Emacs compiled from the emacs25 branch two
issues come up consistently during Org make routine. These issues are
related to changes in the next Emacs version.

[...]
Compiling /home/user/repositories/org-mode/lisp/org-src.el...

In org-src-font-lock-fontify-block:
org-src.el:504:54:Warning: ‘font-lock-fontify-buffer’ is for interactive use
    only; use ‘font-lock-ensure’ or ‘font-lock-flush’ instead.
[...]
Compiling /home/user/repositories/org-mode/lisp/org.el...

In org-fast-tag-selection:
org.el:15261:47:Error: ‘add-to-list’ can’t use lexical var ‘buffer-tags’; use
    ‘push’ or ‘cl-pushnew’
[...]

Note that the .elc files get generated just fine, I mean, the make
routine finishes correctly and Org is still usable.