gsdx: use = default instead of trivial constructor/destructor

reported by clang-tidy

plugins/GSdx/GSDrawScanline.cpp

@@ -35,10 +35,6 @@ GSDrawScanline::GSDrawScanline()
 	m_local.gd = &m_global;
 }
 
-GSDrawScanline::~GSDrawScanline()
-{
-}
-
 void GSDrawScanline::BeginDraw(const GSRasterizerData* data)
 {
 	memcpy(&m_global, &((const SharedData*)data)->global, sizeof(m_global));

plugins/GSdx/GSDrawScanline.h

@@ -63,7 +63,7 @@ protected:
 
 public:
 	GSDrawScanline();
-	virtual ~GSDrawScanline();
+	virtual ~GSDrawScanline() = default;
 
 	// IDrawScanline
 

plugins/GSdx/GSLzma.cpp

@@ -158,9 +158,6 @@ GSDumpRaw::GSDumpRaw(char* filename, const char* repack_filename) : GSDumpFile(f
 	m_start     = 0;
 }
 
-GSDumpRaw::~GSDumpRaw() {
-}
-
 bool GSDumpRaw::IsEof() {
 	return feof(m_fp);
 }

plugins/GSdx/GSLzma.h

@@ -78,7 +78,7 @@ class GSDumpRaw : public GSDumpFile {
 	public:
 
 	GSDumpRaw(char* filename, const char* repack_filename);
-	virtual ~GSDumpRaw();
+	virtual ~GSDumpRaw() = default;
 
 	bool IsEof();
 	void Read(void* ptr, size_t size);

plugins/GSdx/PSX/GPUDrawScanline.cpp

@@ -31,10 +31,6 @@ GPUDrawScanline::GPUDrawScanline()
 	m_local.gd = &m_global;
 }
 
-GPUDrawScanline::~GPUDrawScanline()
-{
-}
-
 void GPUDrawScanline::BeginDraw(const GSRasterizerData* data)
 {
 	memcpy(&m_global, &((const SharedData*)data)->global, sizeof(m_global));

plugins/GSdx/PSX/GPUDrawScanline.h

@@ -56,7 +56,7 @@ protected:
 
 public:
 	GPUDrawScanline();
-	virtual ~GPUDrawScanline();
+	virtual ~GPUDrawScanline() = default;
 
 	// IDrawScanline
 

plugins/GSdx/PSX/GPUState.cpp

@@ -55,10 +55,6 @@ GPUState::GPUState()
 	Reset();
 }
 
-GPUState::~GPUState()
-{
-}
-
 void GPUState::Reset()
 {
 	m_env.Reset();

plugins/GSdx/PSX/GPUState.h

@@ -124,7 +124,7 @@ public:
 
 public:
 	GPUState();
-	virtual ~GPUState();
+	virtual ~GPUState() = default;
 
 	virtual void Reset();
 	virtual void Flush();