Remove unused external variables

Source/PS_Source/PaulStretchControl.cpp

@@ -29,8 +29,6 @@
 
 using namespace std;
 
-extern std::unique_ptr<PropertiesFile> g_propsfile;
-
 Control::Control(AudioFormatManager* afm) : m_afm(afm), m_bufferingthread("stretchbufferingthread")
 {
 	m_stretch_source = std::make_unique<StretchAudioSource>(2,m_afm);

Source/PS_Source/ProcessedStretch.cpp

@@ -21,8 +21,6 @@
 #include <stdio.h>
 #include "ProcessedStretch.h"
 
-extern std::unique_ptr<PropertiesFile> g_propsfile;
-
 ProcessedStretch::ProcessedStretch(REALTYPE rap_,int in_bufsize_,FFTWindow w,bool bypass_,REALTYPE samplerate_,int stereo_mode_)
 	: Stretch(rap_,in_bufsize_,w,bypass_,samplerate_,stereo_mode_)
 {