Ralloc fixes and fixes for Redox execution

src/string/Cargo.toml

@@ -9,5 +9,4 @@ cbindgen = { path = "../../cbindgen" }
 
 [dependencies]
 platform = { path = "../platform" }
-ralloc = { path = "../../ralloc", default-features = false }
 errno = { path = "../errno" }

src/string/src/lib.rs

@@ -3,7 +3,6 @@
 
 extern crate errno;
 extern crate platform;
-extern crate ralloc;
 
 use core::cmp;
 use core::mem;
@@ -192,7 +191,7 @@ pub unsafe extern "C" fn strndup(s1: *const c_char, size: usize) -> *mut c_char
     let len = strnlen(s1, size);
 
     // the "+ 1" is to account for the NUL byte
-    let buffer = ralloc::alloc(len + 1, 1) as *mut c_char;
+    let buffer = platform::alloc(len + 1, 16, 8) as *mut c_char;
     if buffer.is_null() {
         platform::errno = ENOMEM as c_int;
     } else {