Add patches for directories-next/option-ext

The rational is detailed in the root Cargo.toml.

While I don't personally mind MPL dependencies, even if I don't prefer them
(they're allowed in the deny.toml for a reason), I do mind the pointless scope
creep and wish to highlight how little it actually used from the crate by
re-defining it as the single function.

We could also fork directories-next, or directories, and remove the usage of
option-ext per https://github.com/dirs-dev/dirs-sys-rs/issues/24, yet that'd be
a much larger task than what was done here.

In the future, it may be beneficial to submit a PR to wasmtime replacing
directories-next with home, a cargo-team maintained library to get the home
directory and associated folders. An example migration can be found at
https://github.com/harryfei/which-rs/pull/80.

Cargo.lock

@@ -1527,11 +1527,8 @@ dependencies = [
 [[package]]
 name = "directories-next"
 version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "339ee130d97a610ea5a5872d2bbb130fdf68884ff09d3028b81bec8a1ac23bbc"
 dependencies = [
- "cfg-if",
- "dirs-sys-next",
+ "directories",
 ]
 
 [[package]]
@@ -1546,17 +1543,6 @@ dependencies = [
  "windows-sys 0.48.0",
 ]
 
-[[package]]
-name = "dirs-sys-next"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ebda144c4fe02d1f7ea1a7d9641b6fc6b580adcfa024ae48797ecdeb6825b4d"
-dependencies = [
- "libc",
- "redox_users",
- "winapi",
-]
-
 [[package]]
 name = "displaydoc"
 version = "0.2.4"
@@ -4806,8 +4792,6 @@ checksum = "ff011a302c396a5197692431fc1948019154afc178baf7d8e37367442a4601cf"
 [[package]]
 name = "option-ext"
 version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "04744f49eae99ab78e0d5c0b603ab218f515ea8cfe5a456d7629ad883a3b6e7d"
 
 [[package]]
 name = "overload"