Csproj BuildEvents problem in both Linux and Windows

I have found this error with the OpenRa.Mods.RA csproj: copy
"thirdparty/FuzzyLogicLibrary.dll" "$(SolutionDir)", this should be: cd
"$(SolutionDir)thirdparty/"
copy "FuzzyLogicLibrary.dll" "$(SolutionDir)" in two seperated codes,
this FuzzyLogicLibrary.dll copy error can be fixed in both Windows and
Linux environment
Merge pull request #2748 from BugraC/bleed

Csproj BuildEvents problem in both Linux and Windows