- precache switch textures from ANIMATED lump

For example, SW1SKULL and SW2SKULL switches are animated in TNT: Evilution
Their frames are defined in ANIMATED lump which is old BOOM binary format
Textures other than base were not cached because the corresponding switch definitions (in ANIMDEFS lump) have one frame only and BOOM style animations were not taken into account

https://forum.zdoom.org/viewtopic.php?t=66652

src/p_setup.cpp

@@ -96,27 +96,43 @@ static void AddToList(uint8_t *hitlist, FTextureID texid, int bitmask)
 	if (hitlist[texid.GetIndex()] & bitmask) return;	// already done, no need to process everything again.
 	hitlist[texid.GetIndex()] |= (uint8_t)bitmask;
 
-	for (auto anim : TexMan.mAnimations)
+	const auto addAnimations = [hitlist, bitmask](const FTextureID texid)
 	{
-		if (texid == anim->BasePic || (!anim->bDiscrete && anim->BasePic < texid && texid < anim->BasePic + anim->NumFrames))
+		for (auto anim : TexMan.mAnimations)
 		{
-			for (int i = anim->BasePic.GetIndex(); i < anim->BasePic.GetIndex() + anim->NumFrames; i++)
+			if (texid == anim->BasePic || (!anim->bDiscrete && anim->BasePic < texid && texid < anim->BasePic + anim->NumFrames))
 			{
-				hitlist[i] |= (uint8_t)bitmask;
+				for (int i = anim->BasePic.GetIndex(); i < anim->BasePic.GetIndex() + anim->NumFrames; i++)
+				{
+					hitlist[i] |= (uint8_t)bitmask;
+				}
 			}
 		}
-	}
+	};
+
+	addAnimations(texid);
 
 	auto switchdef = TexMan.FindSwitch(texid);
 	if (switchdef)
 	{
-		for (int i = 0; i < switchdef->NumFrames; i++)
+		const FSwitchDef *const pair = switchdef->PairDef;
+		const uint16_t numFrames = switchdef->NumFrames;
+		const uint16_t pairNumFrames = pair->NumFrames;
+
+		for (int i = 0; i < numFrames; i++)
 		{
 			hitlist[switchdef->frames[i].Texture.GetIndex()] |= (uint8_t)bitmask;
 		}
-		for (int i = 0; i < switchdef->PairDef->NumFrames; i++)
+		for (int i = 0; i < pairNumFrames; i++)
+		{
+			hitlist[pair->frames[i].Texture.GetIndex()] |= (uint8_t)bitmask;
+		}
+
+		if (numFrames == 1 && pairNumFrames == 1)
 		{
-			hitlist[switchdef->PairDef->frames[i].Texture.GetIndex()] |= (uint8_t)bitmask;
+			// Switch can still be animated via BOOM binary definition from ANIMATED lump
+			addAnimations(switchdef->frames[0].Texture);
+			addAnimations(pair->frames[0].Texture);
 		}
 	}