Bug#863168: ismrmrd FTBFS on armhf

[Ghislain Vaillant]

ISMRMRD uses a non-portable instruction (#pragma pack) which modifies 
the memory alignment of its data structures. It seems neither armhf nor 
sparc64 supports it, hence the failure of the test suite for both 
architectures.

I am not sure what the best course of action is. Either leaving things 
as is assuming a future rebuild with a newer compiler could improve it, 
disabling the tests or even dropping the packages for the failing 
architectures.

Opinions welcome.

Ghis