[SECURITY] cygwin32-expat, mingw64-$arch-expat, etc.

[Warren Young]

expat 2.1.1 fixes MEDIUM-rated CVE-2015-1283.  I’ve uploaded the regular expat 
2.1.1 packages, but the cross-development packages maintained by Yaakov are all 
at 2.1.0.  Some appear to have 2.1.1 alternate versions available