fix copyrights of graphics code

...com/oracle/truffle/r/library/grDevices/DevicesCCalls.java

...racle/truffle/r/library/grDevices/NullGraphicsDevice.java

...ffle/r/library/grDevices/fastrgd/FastRGraphicsDevice.java

...le/truffle/r/library/grDevices/pdf/PdfGraphicsDevice.java

...oracle/truffle/r/library/graphics/BaseGraphicsSystem.java

...com/oracle/truffle/r/library/graphics/FastRComponent.java

...com/oracle/truffle/r/library/graphics/GraphicsCCalls.java

.../src/com/oracle/truffle/r/library/graphics/RGraphics.java

...uffle/r/library/graphics/core/AbstractGraphicsSystem.java

...le/truffle/r/library/graphics/core/DrawingParameters.java

...racle/truffle/r/library/graphics/core/GraphicsDevice.java

...racle/truffle/r/library/graphics/core/GraphicsEngine.java

...e/truffle/r/library/graphics/core/GraphicsEngineImpl.java

...oracle/truffle/r/library/graphics/core/GraphicsEvent.java

...racle/truffle/r/library/graphics/core/GraphicsSystem.java

...fle/r/library/graphics/core/GraphicsSystemParameters.java

...ry/graphics/core/drawables/CoordinatesDrawableObject.java

...fle/r/library/graphics/core/drawables/DrawableObject.java

...brary/graphics/core/drawables/PolylineDrawableObject.java

...library/graphics/core/drawables/StringDrawableObject.java