add install for arduino gemma drivers: they are in another directory

post_install.bat

@@ -8,4 +8,13 @@ if "%PROCESSOR_ARCHITECTURE%" == "AMD64" (
   drivers\dpinst-x86.exe %ARGS%
 )
 
+REM dpinst /PATH has problems with relative paths, so use absolute path.
+if "%PROCESSOR_ARCHITECTURE%" == "AMD64" (
+  drivers\dpinst-amd64.exe /PATH %cd%\drivers\gemma %ARGS%
+) ELSE IF "%PROCESSOR_ARCHITEW6432%" == "AMD64" (
+  drivers\dpinst-amd64.exe /PATH %cd%\drivers\gemma %ARGS%
+) ELSE (
+  drivers\dpinst-x86.exe /PATH %cd%\drivers\gemma %ARGS%
+)
+
 exit /b 0