fix BinDeps not found error if LightXML installed first
fix WinRPM package name

see https://build.opensuse.org/package/rdiff/windows:mingw:win64/mingw64-libxml2?linkrev=base&rev=29, dll was moved into a separately named package
Merge pull request #9 from tkelman/patch-1

fix BinDeps not found error if LightXML installed first