PortAudio devendored

Closes  #1413
Closes #1414

This commit addresses issues with building PortMixer
using the upstream version of PortAudio.

The resulting solution allows:
* To build Linux with the vanilla PortAudio.
* To build Windows with the vanilla PortAudio, but the notable exceptions:
  * for PortMixer to work on MME - PA 19.7.0 is required; only static linking     is supported. A patch is available to allow dynamic linking;
  * for PortMixer to work on DirectSound - the patch is always required.
Remove nyquist autotools

lib-src/portmixer/cmake/CheckPaWinDS_GetDeviceGUID/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required( VERSION 3.15 )
+project( PaWinDS_GetDeviceGUID )
+
+set( MODULE_DIR "${CMAKE_BINARY_DIR}/../../.." )
+
+set( CMAKE_MODULE_PATH 
+    ${MODULE_DIR}
+    ${CMAKE_MODULE_PATH}
+)
+
+set( PortAudio_DIR ${MODULE_DIR} )
+
+find_package( PortAudio REQUIRED )
+
+add_executable( PaWinDS_GetDeviceGUID check.c )
+target_link_libraries( PaWinDS_GetDeviceGUID PortAudio::PortAudio )

lib-src/portmixer/cmake/CheckPaWinDS_GetDeviceGUID/check.c

@@ -0,0 +1,10 @@
+#include <Windows.h>
+#include <portaudio.h>
+#include <pa_win_ds.h>
+
+int main() 
+{
+    PaWinDS_GetDeviceGUID(0, 0);
+
+    return 0;
+}

lib-src/portmixer/cmake/CheckPaWinMME_GetStreamInputHandle/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required( VERSION 3.15 )
+project( CheckPaWinMME_GetStreamInputHandle )
+
+set( MODULE_DIR "${CMAKE_BINARY_DIR}/../../.." )
+
+set( CMAKE_MODULE_PATH 
+    ${MODULE_DIR}
+    ${CMAKE_MODULE_PATH}
+)
+
+set( PortAudio_DIR ${MODULE_DIR} )
+
+find_package( PortAudio REQUIRED )
+
+add_executable( CheckPaWinMME_GetStreamInputHandle check.c )
+target_link_libraries( CheckPaWinMME_GetStreamInputHandle PortAudio::PortAudio )

lib-src/portmixer/cmake/CheckPaWinMME_GetStreamInputHandle/check.c

@@ -0,0 +1,11 @@
+#include <Windows.h>
+#include <portaudio.h>
+#include <pa_win_wmme.h>
+
+int main() 
+{
+    PaWinMME_GetStreamInputHandle(0, 0);
+    PaWinMME_GetStreamOutputHandle(0, 0);
+
+    return 0;
+}