Disable lvgl original comments in bindings

We disable the comments generation here because some comments
cause the `cargo test` command to fail. Some of the original
comments have invalid tokens like `TYPEDEFS` causing issues.
We should recommend users to look the original comments in the
original lvgl in their C API docs.

README.md

@@ -27,6 +27,12 @@ In order to build the `lvgl` project you will need the following system dependen
 $ sudo apt install build-essential llvm clang
 ```
 
+If you want to build the examples, then you will need to install SDL2 as well.
+
+```
+$ sudo apt install libsdl2-dev
+```
+
 ## Usage
 
 Edit your `Cargo.toml` file dependencies with:

lvgl-sys/build.rs

@@ -101,6 +101,7 @@ fn main() {
     let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
     let bindings = bindgen::Builder::default()
         .header(shims_dir.join("lvgl_sys.h").to_str().unwrap())
+        .generate_comments(false)
         .layout_tests(false)
         .use_core()
         .rustfmt_bindings(true)