Fix build on non-Redox

Cargo.toml

@@ -32,7 +32,6 @@ fatfs = "0.3.0"
 fscommon = "0.1.1"
 gpt = "3.0.0"
 libc = "0.2.70"
-libredox = "0.1"
 pkgar = "0.1.17"
 pkgar-core = "0.1.17"
 pkgar-keys = "0.1.17"
@@ -48,6 +47,9 @@ termion = "4"
 toml = "0.8"
 uuid = { version = "1.4", features = ["v4"] }
 
+[target.'cfg(target_os = "redox")'.dependencies]
+libredox = "0.1"
+
 [patch.crates-io]
 cc-11 = { git = "https://github.com/tea/cc-rs", branch="riscv-abi-arch-fix", package = "cc" }
 # https://github.com/briansmith/ring/issues/1999

src/lib.rs

@@ -684,7 +684,16 @@ where
     with_redoxfs(disk_redoxfs, disk_option.password_opt, callback)
 }
 
+#[cfg(not(target_os = "redox"))]
+pub fn try_fast_install<D: redoxfs::Disk, F: FnMut(u64, u64)>(
+    _fs: &mut redoxfs::FileSystem<D>,
+    _progress: F,
+) -> Result<bool> {
+    Ok(false)
+}
+
 /// Try fast install using live disk memory
+#[cfg(target_os = "redox")]
 pub fn try_fast_install<D: redoxfs::Disk, F: FnMut(u64, u64)>(
     fs: &mut redoxfs::FileSystem<D>,
     mut progress: F,