Update README_MINGW to reflect 2020 changes

windows/README_MINGW

@@ -1,24 +1,31 @@
-HOW TO COMPILE JACK USING WAF AND MINGW
-=======================================
+HOW TO COMPILE JACK ON WINDOWS/MINGW
+====================================
 
 Rev. 1 - 2019-09-01 - First version
 Rev. 2 - 2019-09-18 - Include contributions from @Schroedingers-Cat
 Rev. 3 - 2019-12-14 - Include contributions from @Schroedingers-Cat
-
+Rev. 4 - 2020-11-27 - Rename, update intro and JackRouter build instructions
 
 
 Introduction
 ------------
 
-This guide contains detailed instructions for building JACK on a modern MinGW
-installation. It was conceived as the starting point for unifying the JACK build
-process across all platforms.
+This guide was originally called "How to compile JACK using WAF and MinGW"
+and later renamed to "How to compile JACK on Windows/MinGW" to avoid confusion
+with the official way of building JACK for Windows, which is cross-compiling
+on Linux. That should be considered the only officially supported method now.
+
+Latest binary releases can be found here: https://jackaudio.org/downloads/
+JackRouter here: https://github.com/jackaudio/jack-router/tree/main/binaries
 
-As this is work in progress, there are still a couple of caveats:
+JACK is primarily targeted at Unix systems and thus the required toolchain is
+Unix-centric. So the majority of the guide is actually about setting up the
+required build tools. Once done, the build process itself does not differ much
+from that found on other platforms.
 
-- Asynchronous mode is unusable with low latencies
-- JackRouter still builds using a Visual Studio project
-- Lots of real world testing is needed
+The information here can be of interest to anyone wishing to contribute to the
+development of Windows specific code in JACK, and wants to avoid double booting,
+VMs, etc. That can be particularly helpful when it comes to debug or testing.
 
 
 
@@ -179,28 +186,38 @@ The resulting files can be found at /c/opt/jack/bin, or C:\msys64\opt\jack\bin
 Compiling JackRouter
 --------------------
 
+Source code for JackRouter is not considered part of JACK anymore so you need to
+clone an additional repository:
+
+git clone https://github.com/jackaudio/jack-router
+
 Visual Studio with MFC support is needed to build the included JackRouter VS
 project. The project was tested to successfully generate a 64bit version of
 JackRouter.dll using Visual Studio 2017 and 2019. MFC support can be added from
 the VS installer, by selecting Workloads/Visual C++ build tools/Visual C++ MFC
-for x86 and x64 (valid for VS 2017). Once ready, just open and build the project
+for x86 and x64 (valid for VS 2017).
+
+Once ready, just open and build the project
 
-windows/JackRouter/JackRouter_MinGW_deps.vcxproj
+win/JackRouter.sln
 
-Differences from the original JackRouter.vcxproj:
+Notes:
 
-- Depends on the asiosdk files from the previous MinGW JACK installation (i.e.,
-  it points to absolute paths starting with C:\msys64\opt)
-- Links to the jack.dll.a created by the previous build, instead of libjack.lib
-  This means JackRouter.dll will currently depend on libjack-0.dll
-- Force includes stdint.h and defines _STDINT_H to avoid int8_t, int32_t and
-  uint32_t basic types redefinition during compilation
+- The project assumes the needed ASIO SDK is located in C:\Program Files\asiosdk
+  you can simply copy the SDK from the MinGW JACK installation, i.e. from
+  C:\msys64\opt to C:\Program Files
+- Links against C:\Program Files\JACK2\lib\libjack64.dll.a which is the libjack
+  version installed by the official installer. You will have to update that path
+  so it points to the jack.dll.a created by the MinGW build instead.
 
 
 
 Running and distributing
 ------------------------
 
+!! This section is kept for historical reasons. The official JACK for Windows
+build method includes the necessary steps to create a installer. !!
+
 An automated installation process should copy files to two destinations. One for
 the JACK server binary and standalone tools, and another for the client library.
 The latter is needed by JACK enabled applications in order to be able to connect