Updated build instructions for portaudio MinGW builds on MS Windows

These instructions  recommend building v19.06, and  patching to enable
shared library builds. This will allow  users to substitute a build of
libportaudio-2.dll  with   ASIO  support   if  required.    We  cannot
redistribute  binaries  with  proprietary, closed  sources,  like  the
Steinberg  ASIO  SDK,  although  users can  build  it  themselves  for
personal use.

doc/building on MS Windows.txt

@@ -103,13 +103,13 @@ repository which can be cloned with this command:
 
 Next you must build Hamlib using the MinGW compiler tools bundled with
 Qt. As you  will build Hamlib again when there  are updates you should
-set  up  you  Msys2  command  line  environment  for  this.  I  use  a
+set  up  you  MSYS2  command  line  environment  for  this.  I  use  a
 $HOME/.bash_profile file containing these lines:
 
     dll_paths_64bit=/c/Tools/libusb-1.0.23/MinGW64/dll
     export PATH=/c/Qt/Tools/mingw810_64/bin:$dll_paths_64bit:$PATH
 
-Test the amended ~/.bash_profile file by opening a new Msys2 shell and
+Test the amended ~/.bash_profile file by opening a new MSYS2 shell and
 typing:
 
     which gcc
@@ -122,7 +122,7 @@ Hamlib sources:
     cd ~/src/sf/bsomervi/hamlib
     ./bootstrap
 
-Now you need to configure and build Hamlib from an Msys2 shell. Create
+Now you need to configure and build Hamlib from an MSYS2 shell. Create
 a build directory outside of the  Hamlib sources you have just cloned,
 then change working directory to that build directory.
 
@@ -174,20 +174,36 @@ portaudio
 ---------
 
 This library  is only available as  sources so must be  built. It uses
-autotools  and  building using  MinGW  tools  from  an Msys  shell  is
-recommended. Ensure  your Msys  shell environment (PATH)  is correctly
+autotools  and building  using  MinGW  tools from  an  MSYS2 shell  is
+recommended. Ensure  your MSYS2 shell environment  (PATH) is correctly
 set up for the MinGW tool chain you wish to build with, i.e. the MinGW
 tools bundled with the Qt installation for 32-, or 64-bit as required.
 
-Download   the   latest   stable    version   sources   tarball   from
+Download    this    specific    version's   sources    tarball    from
 http://files.portaudio.com/download.html , at the time of writing that
-was  the pa_stable_v190700_20210406.tgz  file.  Unzip  and unpack  the
+was  the pa_stable_v190600_20161030.tgz  file.  Unzip  and unpack  the
 tarball in a suitable location like ~/src :
 
     cd ~/src
     tar xf ~/Downloads/pa_stable_v190700_20210406.tgz
 
-out-of-source-tree builds are recommended, create a build directory in
+
+Note that on Windows portaudio  will only build static libraries using
+the standard configuration, we  prefer dynamic libraries for portaudio
+as  users may  wish to  substitute a  build of  the library  with ASIO
+support for personal  use (we cannot redistribute  binaries built from
+proprietary closed source sources like the Steinberg ASIO SDK).
+
+In order  to build  DLLs on  Windows the  configure script  requires a
+patch as follows:
+
+    sed -i -e 's/-luuid//g' ~/src/portaudio/configure
+
+This removes  linker dependencies on the  MS uuid library since  it is
+only  available as  a static  archive  and using  that would  disallow
+shared library creation.
+
+Out-of-source-tree builds are recommended, create a build directory in
 a suitable location like ~/build and change working directory to it:
 
     mkdir -p ~/build/portaudio/mingw64
@@ -196,10 +212,11 @@ a suitable location like ~/build and change working directory to it:
 Configure and build and install the library in a suitable place (I use
 ~/local as a root directory for installed packages.
 
-    ~/src/portaudio/configure --prefix=$(HOME)/local/portaudio/mingw64 --with-winapi=wmme,directx,wdmks CFLAGS=-DNDEBUG
+    ~/src/portaudio/configure --prefix=$(HOME)/local/portaudio/mingw64 \
+       --with-winapi=wmme,directx,wdmks --disable-static --enable-shared CFLAGS=-DNDEBUG
     make && make install
 
-Repeat for the 32-bit architecture  if required, using a suitable Msys
+Repeat for the 32-bit architecture if required, using a suitable MSYS2
 environment for  the required  tool chain, different  build directory,
 and install location.
 
@@ -216,6 +233,11 @@ chain files:
 and similarly with  the 32-bit tool chain file  specifying the mingw32
 portaudio installation root directory.
 
-Note that on Windows portaudio  will only build static libraries using
-the standard  configuration, this  is fine and  therefore there  is no
-need to add any new run-time paths to your execution environment.
+To run Debug configuration WSJT-X builds you will also need to add the
+location of the portaudio DLL to your PATH environment variable, like:
+
+   SET "Path=%UserProfile%\local\portaudio\mingw64\bin;%Path%"
+
+Verify the setup with:
+
+   WHERE libportaudio-2.dll