committing this for the historical record before I delete it, because it doesn't work.
ok, put rt-based platforms back the way they were.  the .targets file will copytooutputdirectory the proper version of sqlite3.dll based on the setting of the Platform msbuild variable.  building for anycpu is not supported, because including the sqlite3.dll requires adding the visual c++ runtime sdk, and THAT doesn't support building for anycpu.