Migrate most of wasmtime from lazy_static to once_cell (#4368)

* Update tracing-core to a version which doesn't depend on lazy-static.

* Update crossbeam-utils to a version that doesn't depend on lazy-static.

* Update crossbeam-epoch to a version that doesn't depend on lazy-static.

* Update clap to a version that doesn't depend on lazy-static.

* Convert Wasmtime's own use of lazy_static to once_cell.

* Make `GDB_REGISTRATION`'s comment a doc comment.

* Fix compilation on Windows.

crates/test-programs/wasi-tests/Cargo.lock

@@ -1,10 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-[[package]]
-name = "lazy_static"
-version = "1.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+version = 3
 
 [[package]]
 name = "libc"
@@ -18,6 +14,12 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0debeb9fcf88823ea64d64e4a815ab1643f33127d995978e099942ce38f25238"
 
+[[package]]
+name = "once_cell"
+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7709cef83f0c1f58f666e746a08b21e0085f7440fa6a29cc194d68aac97a4225"
+
 [[package]]
 name = "wasi"
 version = "0.10.2+wasi-snapshot-preview1"
@@ -28,8 +30,8 @@ checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
 name = "wasi-tests"
 version = "0.19.0"
 dependencies = [
- "lazy_static",
  "libc",
  "more-asserts",
+ "once_cell",
  "wasi",
 ]

crates/test-programs/wasi-tests/Cargo.toml

@@ -10,7 +10,7 @@ publish = false
 libc = "0.2.65"
 wasi = "0.10.2"
 more-asserts = "0.2.1"
-lazy_static = "1.4"
+once_cell = "1.12.0"
 
 # This crate is built with the wasm32-wasi target, so it's separate
 # from the main Wasmtime build, so use this directive to exclude it

crates/test-programs/wasi-tests/src/lib.rs

@@ -1,9 +1,8 @@
 use more_asserts::assert_gt;
 pub mod config;
+use once_cell::sync::Lazy;
 
-lazy_static::lazy_static! {
-    pub static ref TESTCONFIG: config::TestConfig = config::TestConfig::from_env();
-}
+pub static TESTCONFIG: Lazy<config::TestConfig> = Lazy::new(config::TestConfig::from_env);
 
 // The `wasi` crate version 0.9.0 and beyond, doesn't
 // seem to define these constants, so we do it ourselves.