Clang cleanup

"taking the absolute value of unsigned type 'unsigned int' has no effect"

using abs() on an unsigned should be nop, replace them with (angle_t)()

Need someone to verify this does not break any game logic

src/hardware/hw_main.c

@@ -3404,12 +3404,6 @@ static void HWR_ClearSprites(void)
gr_visspritecount = 0;
}
-static inline void HWR_ResetVisSpriteChunks(void)
-{
-	memset(gr_visspritechunks, 0, sizeof(gr_visspritechunks));
-}
-
-
// --------------------------------------------------------------------------
// HWR_NewVisSprite
// --------------------------------------------------------------------------