[Merge] lp:~brandontschaefer/libsdl/enable-mir-support-ffe into lp:ubuntu/libsdl2

[Colin Watson]

This is going to make libsdl2 not build on some architectures it
currently builds on, which will fail proposed-migration (and for good
reason).  You need to restrict this change to only architectures where
libmirclient-dev is currently available, not just to linux-any.

-- 
https://code.launchpad.net/~brandontschaefer/libsdl/enable-mir-support-ffe/+merge/212072
Your team Ubuntu branches is requested to review the proposed merge of lp:~brandontschaefer/libsdl/enable-mir-support-ffe into lp:ubuntu/libsdl2.