Fix FindMysql on windows
The issue was that the FindMySQL.cmake is using try_run to find the MySQL_VERSION (something inherited from the original TangoDatabase/FindMySQL.cmake) and this was failing to run because of missing DLLs. Although it is hard to tell, I believe the missing DLL is the msvc redistributable, which is required by the mysql.dll we are using. Rather than trying to install this I decided to just disable the check (by setting MySQL_VERSION) because I think the correct answer is to try and remove the try_run from FindMySQL.cmake, but I would rather leave that for later.