[PATCH] configure: Check for -Wno-pragma-pack

[Thomas Faber]

On 2018-01-21 23:05, Martin Storsjo wrote:
> Recent clang versions warn if an include file changes the pragma
> pack level without restoring it before the end of the include file.
> 
> This avoids warnings for each include of pshpack*.h/poppack.h.

Do you think a #pragma clang diagnostic inside those headers would be 
feasible, to avoid hiding true positive instances of this warning?

Best,
Thomas