Bump littlefs version

This patch:

- Bumps the littlefs version to the latest released (v2.9.3)
- Adds a "multiversion" feature flag that exposes the littlefs feature
of the same name

Cargo.toml

@@ -10,11 +10,12 @@ categories = ["embedded", "filesystem", "no-std"]
 repository = "https://github.com/nickray/littlefs2-sys"
 
 [build-dependencies]
-bindgen = { version = "0.69.4", default-features = false , features = ["runtime"] }
+bindgen = { version = "0.70.1", default-features = false , features = ["runtime"] }
 cc = "1"
 
 [features]
 assertions = []
 trace = []
 malloc = []
 software-intrinsics = []
+multiversion = []

build.rs

@@ -4,7 +4,7 @@ use std::path::PathBuf;
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let mut builder = cc::Build::new();
     let builder = builder
-        .flag("-std=c11")
+        .flag("-std=c99")
         .flag("-DLFS_NO_DEBUG")
         .flag("-DLFS_NO_WARN")
         .flag("-DLFS_NO_ERROR")
@@ -24,17 +24,29 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     #[cfg(not(feature = "malloc"))]
     builder.flag("-DLFS_NO_MALLOC");
 
+    #[cfg(feature = "multiversion")]
+    let builder = builder.flag("-DLFS_MULTIVERSION");
+
     builder.compile("lfs-sys");
 
-    let bindings = bindgen::Builder::default()
+    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
+
+    let bindgen = bindgen::Builder::default()
         .header("littlefs/lfs.h")
+        .clang_arg("-std=c99")
+        .clang_arg("-DLFS_NO_DEBUG")
+        .clang_arg("-DLFS_NO_WARN")
+        .clang_arg("-DLFS_NO_ERROR");
+    #[cfg(feature = "multiversion")]
+    let bindgen = bindgen.clang_arg("-DLFS_MULTIVERSION");
+
+    let bindings = bindgen
         .use_core()
         .allowlist_item("lfs_.*")
         .allowlist_item("LFS_.*")
         .generate()
         .expect("Unable to generate bindings");
 
-    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
     bindings
         .write_to_file(out_path.join("bindings.rs"))
         .expect("Couldn't write bindings!");