[rust] ahash patch due to toolchain update

This crate has a build error relating to the `stdsimd` feature use. This
has been fixed in newer versions of the crate, however on the one
checked out in the repo, this is still an issue.

This change fixes this issue by importing the fix[1] provided by the
authors.

[1] tkaitchuck/aHash#201

third_party/rust/ahash/v0_7/crate/build.rs

@@ -7,7 +7,9 @@ fn main() {
     if let Some(channel) = version_check::Channel::read() {
         if channel.supports_features() {
             println!("cargo:rustc-cfg=feature=\"specialize\"");
-            println!("cargo:rustc-cfg=feature=\"stdsimd\"");
+            if version_check::Version::read().map_or(false, |v| v.at_most("1.77.9")) {
+                println!("cargo:rustc-cfg=feature=\"stdsimd\"");
+            }
         }
     }
     let os = env::var("CARGO_CFG_TARGET_OS").expect("CARGO_CFG_TARGET_OS was not set");