Add remaining libs to CMake

These now all appear in the MSVC project.
Currently only FileDialog, Nyquist, mod-script-pipe compile and link, and Audacity compiles.
Still to set include directories and flags for most of the libs.

cmake-proxies/portmixer/CMakeLists.txt

@@ -0,0 +1,27 @@
+#directory cmake-proxies/portmixer
+set( TARGET portmixer )
+set( TARGET_SOURCE ${LIB_SRC_DIRECTORY}${TARGET} )
+project( ${TARGET} )
+
+set( SOURCES 
+${LIB_SRC_DIRECTORY}portmixer/px_tests/px_test.c
+${LIB_SRC_DIRECTORY}portmixer/src/px_example_api.c
+${LIB_SRC_DIRECTORY}portmixer/src/px_linux_alsa.c
+${LIB_SRC_DIRECTORY}portmixer/src/px_mac_coreaudio.c
+${LIB_SRC_DIRECTORY}portmixer/src/px_mixer.c
+${LIB_SRC_DIRECTORY}portmixer/src/px_unix_oss.c
+${LIB_SRC_DIRECTORY}portmixer/src/px_win_common.c
+${LIB_SRC_DIRECTORY}portmixer/src/px_win_ds.c
+${LIB_SRC_DIRECTORY}portmixer/src/px_win_endpoint.c
+${LIB_SRC_DIRECTORY}portmixer/src/px_win_wasapi.c
+${LIB_SRC_DIRECTORY}portmixer/src/px_win_wmme.c
+)
+# This defines the #define on both Windows and Linux.
+add_definitions(  )
+add_library( ${TARGET} STATIC ${SOURCES})
+
+target_include_directories( ${TARGET} PRIVATE 
+
+)
+
+target_link_libraries( ${TARGET} )