always use C locale on Windows

pgrx-pg-config/src/lib.rs

@@ -29,11 +29,7 @@ pub static BASE_POSTGRES_TESTING_PORT_NO: u16 = 32200;
 /// The flags to specify to get a "C.UTF-8" locale on this system, or "C" locale on systems without
 /// a "C.UTF-8" locale equivalent.
 pub fn get_c_locale_flags() -> &'static [&'static str] {
-    #[cfg(target_os = "macos")]
-    {
-        &["--locale=C", "--lc-ctype=UTF-8"]
-    }
-    #[cfg(not(target_os = "macos"))]
+    #[cfg(all(target_family = "unix", not(target_os = "macos")))]
     {
         match Command::new("locale").arg("-a").output() {
             Ok(cmd)
@@ -47,6 +43,14 @@ pub fn get_c_locale_flags() -> &'static [&'static str] {
             _ => &["--locale=C"],
         }
     }
+    #[cfg(target_os = "macos")]
+    {
+        &["--locale=C", "--lc-ctype=UTF-8"]
+    }
+    #[cfg(target_os = "windows")]
+    {
+        &["--locale=C"]
+    }
 }
 
 // These methods were originally in `pgrx-utils`, but in an effort to consolidate