Windows - update gem doc and script references

Aubio and sys-proctable dont need to be installed as gems - the vendored versions work just fine.

However, ffi is needed.

Author: samaaron

INSTALL-WINDOWS.md

@@ -28,10 +28,10 @@ setx QT_INSTALL_LOCATION32 C:\Qt\Qt5.14.1\5.14.1\msvc2017 (restart command promp
 Install Ruby from http://rubyinstaller.org/downloads. Get the version with the devkit, 64 or 32 bit, depending on your platform.  You should update aubio to 3.3 if you have an older version.
 ```
 https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-2.6.5-1/rubyinstaller-devkit-2.6.5-1-x64.exe
+
 gem install win32-process
 gem install rugged --version 0.27.1
-gem install aubio
-gem install sys-proctable
+gem install ffi
 ```
 Run a console as administrator. Add a link to Ruby:
 ```

app/gui/qt/win-prebuild.bat

@@ -5,11 +5,6 @@ cd %~dp0
 @echo Copying aubio to the server...
 copy external\build\aubio-prefix\src\aubio-build\Release\libaubio-5.dll ..\..\server\native\ruby\bin
 
-
-
-rmdir /S /Q ..\..\server\ruby\vendor\ruby-aubio-0.3.3
-
-
 @echo Copying osmid to the server...
 xcopy /Y /I /R /E external\build\osmid-prefix\src\osmid-build\Release\*.exe ..\..\server\native\osmid
 

app/gui/qt/win-prebuild32.bat

@@ -5,8 +5,6 @@ cd %~dp0
 @echo Copying aubio to the server...
 copy external\build_x86\aubio-prefix\src\aubio-build\Release\libaubio-5.dll ..\..\server\native\ruby\bin
 
-rmdir /S /Q ..\..\server\ruby\vendor\ruby-aubio-0.3.3
-
 @echo Copying osmid to the server
 xcopy /Y /I /R /E external\build_x86\osmid-prefix\src\osmid-build\Release\*.exe ..\..\server\native\osmid