Bug#845749: libwebp FTBFS on armhf: inlining failed in call to always_inline 'vtrnq_s32': target specific option mismatch

[Jeff Breidenbach]

Ubuntu may have the patch for this. If so, okay to NMU.

https://patches.ubuntu.com/libw/libwebp/libwebp_0.5.1-2ubuntu1.patch