Fix Android clang compiler path when building with Windows host (#489)

* Fix android clang compiler path when building with Windows host

* Only use the cmd clang compiler if the exe clang doesn't exist

src/lib.rs

@@ -1981,10 +1981,19 @@ impl Build {
                         .replace("thumbv7", "arm");
                     let gnu_compiler = format!("{}-{}", target, gnu);
                     let clang_compiler = format!("{}-{}", target, clang);
+                    // On Windows, the Android clang compiler is provided as a `.cmd` file instead
+                    // of a `.exe` file. `std::process::Command` won't run `.cmd` files unless the
+                    // `.cmd` is explicitly appended to the command name, so we do that here.
+                    let clang_compiler_cmd = format!("{}-{}.cmd", target, clang);
+
                     // Check if gnu compiler is present
                     // if not, use clang
                     if Command::new(&gnu_compiler).spawn().is_ok() {
                         gnu_compiler
+                    } else if host.contains("windows")
+                        && Command::new(&clang_compiler).spawn().is_err()
+                    {
+                        clang_compiler_cmd
                     } else {
                         clang_compiler
                     }