Fix build.rs

Author: unknown

.gitignore

@@ -5,4 +5,6 @@ build
 *.obj
 *.lib
 *.wasm
-package-lock.json
+package-lock.json
+Cargo.lock
+target

bindings/rust/build.rs

@@ -25,16 +25,14 @@ fn main() {
     // If your language uses an external scanner written in C++,
     // then include this block of code:
 
-    /*
     let mut cpp_config = cc::Build::new();
     cpp_config.cpp(true);
     cpp_config.include(&src_dir);
     cpp_config
         .flag_if_supported("-Wno-unused-parameter")
         .flag_if_supported("-Wno-unused-but-set-variable");
-    let scanner_path = src_dir.join("scanner.cc");
+    let scanner_path = src_dir.join("scanner.c");
     cpp_config.file(&scanner_path);
     cpp_config.compile("scanner");
     println!("cargo:rerun-if-changed={}", scanner_path.to_str().unwrap());
-    */
 }