feat: add windows-gnu to rust tests

.github/workflows/rust-tests.yml

@@ -36,6 +36,8 @@ jobs:
             target: x86_64-unknown-linux-gnu
           - host: windows-latest
             target: x86_64-pc-windows-msvc
+          - host: windows-latest
+            target: x86_64-pc-windows-gnu
           - host: macos-14
             target: aarch64-apple-darwin
           - host: macos-latest

bindings/rust/build.rs

@@ -11,15 +11,19 @@ fn main() {
 
     let mut cc = cc::Build::new();
 
-    #[cfg(all(windows, target_env = "msvc"))]
+    #[cfg(windows)]
     {
         cc.flag("-D_CRT_SECURE_NO_WARNINGS");
 
         // In blst, if __STDC_VERSION__ isn't defined as c99 or greater, it will typedef a bool to
         // an int. There is a bug in bindgen associated with this. It assumes that a bool in C is
         // the same size as a bool in Rust. This is the root cause of the issues on Windows. If/when
         // this is fixed in bindgen, it should be safe to remove this compiler flag.
+        #[cfg(target_env = "msvc")]
         cc.flag("/std:c11");
+
+        #[cfg(target_env = "gnu")]
+        cc.flag("-std=c++11");
     }
 
     cc.include(c_src_dir.clone());