- fixed sky cap color handling

Backported from Raze

src/common/rendering/hwrenderer/data/hw_skydome.cpp

@@ -471,7 +471,8 @@ void FSkyVertexBuffer::DoRenderDome(FRenderState& state, FGameTexture* tex, int
 	// The caps only get drawn for the main layer but not for the overlay.
 	if (mode == FSkyVertexBuffer::SKYMODE_MAINLAYER && tex != nullptr)
 	{
-		auto& col = R_GetSkyCapColor(tex);
+		auto col = R_GetSkyCapColor(tex);
+
 		col.first.r = col.first.r * color.r / 255;
 		col.first.g = col.first.g * color.g / 255;
 		col.first.b = col.first.b * color.b / 255;

src/common/utility/vectors.h

@@ -47,7 +47,6 @@
 #include "xs_Float.h"
 #include "math/cmath.h"
 
-class FSerializer;
 
 #define EQUAL_EPSILON (1/65536.)