Merge pull request from GHSA-wh6w-3828-g9qf

* Unconditionally use `MemoryImageSlot`

This commit removes the internal branching within the pooling instance
allocator to sometimes use a `MemoryImageSlot` and sometimes now.
Instead this is now unconditionally used in all situations on all
platforms. This fixes an issue where the state of a slot could get
corrupted if modules being instantiated switched from having images to
not having an image or vice versa.

The bulk of this commit is the removal of the `memory-init-cow`
compile-time feature in addition to adding Windows support to the
`cow.rs` file.

* Fix compile on Unix

* Add a stricter assertion for static memory bounds

Double-check that when a memory is allocated the configuration required
is satisfied by the pooling allocator.

crates/runtime/Cargo.toml

@@ -23,7 +23,7 @@ thiserror = "1.0.4"
 cfg-if = "1.0"
 rand = "0.8.3"
 anyhow = { workspace = true }
-memfd = { version = "0.6.1", optional = true }
+memfd = "0.6.1"
 paste = "1.0.3"
 encoding_rs = { version = "0.8.31", optional = true }
 
@@ -52,8 +52,6 @@ cc = "1.0"
 maintenance = { status = "actively-developed" }
 
 [features]
-memory-init-cow = ['memfd']
-
 async = ["wasmtime-fiber"]
 
 # Enables support for the pooling instance allocator