MSVC projects - accommodate some modules that recently got moved or removed

(mostly these got moved out of the PortAudio backend and into libpbd)

libs/backends/MSVCbackends/portaudio_audiobackend.vcproj

@@ -272,10 +272,6 @@
 				RelativePath="..\portaudio\midi_util.cc"
 				>
 			</File>
-			<File
-				RelativePath="..\portaudio\mmcss.cc"
-				>
-			</File>
 			<File
 				RelativePath="..\portaudio\portaudio_backend.cc"
 				>
@@ -284,10 +280,6 @@
 				RelativePath="..\portaudio\portaudio_io.cc"
 				>
 			</File>
-			<File
-				RelativePath="..\portaudio\win_utils.cc"
-				>
-			</File>
 			<File
 				RelativePath="..\portaudio\winmmemidi_input_device.cc"
 				>
@@ -322,10 +314,6 @@
 				RelativePath="..\portaudio\midi_util.h"
 				>
 			</File>
-			<File
-				RelativePath="..\portaudio\mmcss.h"
-				>
-			</File>
 			<File
 				RelativePath="..\portaudio\portaudio_backend.h"
 				>
@@ -338,10 +326,6 @@
 				RelativePath="..\portaudio\rt_thread.h"
 				>
 			</File>
-			<File
-				RelativePath="..\portaudio\win_utils.h"
-				>
-			</File>
 			<File
 				RelativePath="..\portaudio\winmmemidi_input_device.h"
 				>