Remove dependency on filetime crate

Android doesn't have the filetime crate vendored into the tree, but
as of rust 1.75, the standard library has the ability to change
filetimes.

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - uses: dtolnay/rust-toolchain@1.70.0
+    - uses: dtolnay/rust-toolchain@1.75.0
       with:
         components: rustfmt
     - name: Check formatting

Cargo.toml

@@ -11,7 +11,7 @@ readme = "README.md"
 repository = "https://github.com/evmar/n2"
 # https://github.com/evmar/n2/issues/74
 # Note: if we bump this, may need to bump .github/workflows/ci.yml version too.
-rust-version = "1.70.0"
+rust-version = "1.75.0"
 description = "a ninja compatible build system"
 
 [dependencies]
@@ -37,7 +37,6 @@ jemallocator = "0.5.0"
 [dev-dependencies]
 tempfile = "3.6.0"
 criterion = { version = "0.5.1", features = ["html_reports"] }
-filetime = "0.2"
 
 [profile.release]
 debug = true

tests/e2e/mod.rs

@@ -80,7 +80,8 @@ impl TestSpace {
     pub fn sub_mtime(&self, path: &str, dur: std::time::Duration) -> anyhow::Result<()> {
         let path = self.dir.path().join(path);
         let t = std::time::SystemTime::now() - dur;
-        filetime::set_file_mtime(path, filetime::FileTime::from_system_time(t))?;
+        let f = std::fs::File::options().write(true).open(path)?;
+        f.set_modified(t)?;
         Ok(())
     }