Build support when cross-compiling.  Fix for https://bugzilla.novell.com/show_bug.cgi?id=661054
Atom10FeedFormatter should generate subtitle tag for Description property
Merge pull request #699 from linquize/atom-bug-2-10

Atom bug 2 10
Fix compilation of System.Core tests.
fix compilation under NET_2_0
ifdef 4.0 using
Fix System.Web.Routing test build.
Fix make check PROFILE=net_2_0 in System.Runtime.Serialization.
Fix tests compilation
Fix make check PROFILE=net_3_5 in Microsoft.Build.Tasks.
Merge pull request #465 from symform/cross-compile-support

Build support when cross-compiling.