Stop checking ChannelLiquidity's in-memory size

We generally expect `ChannelLiquidity` to be exactly three cache
lines to ensure the first bytes we need are all one one cache line.
This improves performance very marginally on some machines, but
the assertions that this is true do not work on some Android 32-bit
machines due to differing `Duration` sizes.

Here we simply remove the assertions to fix build on platforms
where the struct size isn't exactly on cache lines. This may
marginally harm performance but it shouldn't be that critical.

Fixes #3415

Author: TheBlueMatt

lightning/src/routing/scoring.rs

@@ -903,16 +903,6 @@ struct ChannelLiquidity {
 	offset_history_last_updated: Duration,
 }
 
-// Check that the liquidity HashMap's entries sit on round cache lines.
-//
-// Specifically, the first cache line will have the key, the liquidity offsets, and the total
-// points tracked in the historical tracker.
-//
-// The next two cache lines will have the historical points, which we only access last during
-// scoring, followed by the last_updated `Duration`s (which we do not need during scoring).
-const _LIQUIDITY_MAP_SIZING_CHECK: usize = 192 - ::core::mem::size_of::<(u64, ChannelLiquidity)>();
-const _LIQUIDITY_MAP_SIZING_CHECK_2: usize = ::core::mem::size_of::<(u64, ChannelLiquidity)>() - 192;
-
 /// A snapshot of [`ChannelLiquidity`] in one direction assuming a certain channel capacity.
 struct DirectedChannelLiquidity<L: Deref<Target = u64>, HT: Deref<Target = HistoricalLiquidityTracker>, T: Deref<Target = Duration>> {
 	min_liquidity_offset_msat: L,