python-brotli needs C++ since its addition in commit
2f176b837b so add a comment about it
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit dbf34f5c11)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>