msbuild failonerror=false for older mono versions that support 2.0 stuff but not Microsoft.Build
msbuild failonerror=false for older mono versions that support 2.0 stuff but not Microsoft.Build

git-svn-id: fcce7d6ce0ac15bf24f68871b5145d46fc068279@2118 2c1201b4-01cd-e047-a400-b836ae1fbc61

boo/boo-lang,boo/boo-lang,boo/boo-lang,boo/boo-lang,boo/boo-lang,boo/boo-lang,boo/boo-lang