set cmake generator for windows msvc as recommended

build.rs

@@ -1,3 +1,13 @@
 fn main() {
-    cmake::build("flatbuffers");
+    let mut config = cmake::Config::new("flatbuffers");
+
+    // specially set the visual studio generator version on msvc windows
+    // this generator is recommended by https://google.github.io/flatbuffers/flatbuffers_guide_building.html
+    let target = std::env::var("TARGET").unwrap();
+    let host = std::env::var("HOST").unwrap();
+    if target.contains("msvc") && host.contains("windows") {
+        config.generator("Visual Studio 10 Win64");
+    }
+
+    config.build();
 }