Add missing virtual destructors.

src/OpenGL/compiler/OutputASM.h

@@ -89,6 +89,7 @@ namespace glsl
 	{
 		friend class OutputASM;
 	public:
+		virtual ~Shader() {};
 		virtual sw::Shader *getShader() const = 0;
 		virtual sw::PixelShader *getPixelShader() const;
 		virtual sw::VertexShader *getVertexShader() const;

src/OpenGL/libEGL/Context.hpp

@@ -14,6 +14,7 @@ class Image;
 class Context
 {
 public:
+	virtual ~Context() {};
 	virtual void destroy() = 0;
 	virtual void makeCurrent(Surface *surface) = 0;
 	virtual void bindTexImage(Surface *surface) = 0;

src/Shader/Shader.hpp

@@ -474,7 +474,7 @@ namespace sw
 
 		Shader();
 
-		~Shader();
+		virtual ~Shader();
 
 		int getSerialID() const;
 		size_t getLength() const;