[TyGL] Fixed an ordering bug in the trapezoid-builder.

Patch by Zoltan Herczeg.

Changes to be committed:
	modified:   Source/WebCore/platform/graphics/tygl/TrapezoidBuilderTyGL.cpp
	modified:   Source/WebCore/platform/graphics/tygl/TrapezoidBuilderTyGL.h
[TyGL] Fixed fmod bug in addArc() method.

Changes to be committed:
	modified:   Source/WebCore/platform/graphics/tygl/PathTyGL.cpp