hildon, weston: Fix for 32 bit x86

We had a lot of packages that were disabled for x86 because alpine's aport of libunwind didn't support x86. They fixed that about a week ago.

I also found a bug in hildon-desktop that causes a compiler error when compiling for x86, so I included a patch for that which I also submitted upstream.

FYI, there is a lot of overlap between this and !130 (merged).