fix: Patch coarsetime for MIPS AtomicU64 support

- Vendor coarsetime crate with portable-atomic fallback
- Use portable-atomic on targets without 64-bit atomics
- Patch crates.io to use local coarsetime
- Fixes MIPS build failure (AtomicU64 missing)

third_party/coarsetime/Cargo.toml

@@ -0,0 +1,82 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+name = "coarsetime"
+version = "0.1.37"
+authors = ["Frank Denis <github@pureftpd.org>"]
+build = false
+autolib = false
+autobins = false
+autoexamples = false
+autotests = false
+autobenches = false
+description = "Time and duration crate optimized for speed"
+homepage = "https://github.com/jedisct1/rust-coarsetime"
+readme = "README.md"
+keywords = [
+    "time",
+    "date",
+    "duration",
+]
+categories = [
+    "concurrency",
+    "date-and-time",
+    "os",
+]
+license = "BSD-2-Clause"
+repository = "https://github.com/jedisct1/rust-coarsetime"
+
+[features]
+wasi-abi2 = ["dep:wasi-abi2"]
+
+[lib]
+name = "coarsetime"
+path = "src/lib.rs"
+
+[[bench]]
+name = "benchmark"
+path = "benches/benchmark.rs"
+harness = false
+
+[dev-dependencies.benchmark-simple]
+version = "0.1.10"
+
+[dependencies.portable-atomic]
+version = "1.6"
+
+[target.'cfg(all(any(target_arch = "wasm32", target_arch = "wasm64"), target_os = "unknown"))'.dependencies.wasm-bindgen]
+version = "0.2"
+
+[target.'cfg(any(target_os = "wasix", target_os = "wasi"))'.dependencies.wasix]
+version = "0.13"
+
+[target.'cfg(not(any(target_os = "wasix", target_os = "wasi")))'.dependencies.libc]
+version = "0.2"
+
+[target.'cfg(target_os = "wasi")'.dependencies.wasi-abi2]
+version = "0.14.7"
+optional = true
+package = "wasi"
+
+[profile.bench]
+codegen-units = 1
+
+[profile.dev]
+overflow-checks = true
+
+[profile.release]
+opt-level = 3
+lto = true
+codegen-units = 1
+panic = "abort"
+incremental = false