Add support for CloudABI running on 32-bit ARM systems.

Author: EdSchouten

src/cloudabi/arm.rs

@@ -0,0 +1,4 @@
+pub type c_char = u8;
+pub type c_long = i32;
+pub type c_ulong = u32;
+pub type wchar_t = u32;

src/cloudabi/mod.rs

@@ -151,6 +151,9 @@ cfg_if! {
     if #[cfg(target_arch = "aarch64")] {
         mod aarch64;
         pub use self::aarch64::*;
+    } else if #[cfg(any(target_arch = "arm"))] {
+        mod arm;
+        pub use self::arm::*;
     } else if #[cfg(any(target_arch = "x86"))] {
         mod x86;
         pub use self::x86::*;