Android: Fix unused-imports warning

Author: tbu-

src/libstd/sys/unix/android.rs

@@ -31,7 +31,6 @@
 use libc::{c_int, c_void, sighandler_t, size_t, ssize_t};
 use libc::{ftruncate, pread, pwrite};
 
-use convert::TryInto;
 use io;
 use super::{cvt, cvt_r};
 
@@ -128,6 +127,7 @@ pub fn ftruncate64(fd: c_int, size: u64) -> io::Result<()> {
 pub unsafe fn cvt_pread64(fd: c_int, buf: *mut c_void, count: size_t, offset: i64)
     -> io::Result<ssize_t>
 {
+    use convert::TryInto;
     weak!(fn pread64(c_int, *mut c_void, size_t, i64) -> ssize_t);
     pread64.get().map(|f| cvt(f(fd, buf, count, offset))).unwrap_or_else(|| {
         if let Ok(o) = offset.try_into() {
@@ -143,6 +143,7 @@ pub unsafe fn cvt_pread64(fd: c_int, buf: *mut c_void, count: size_t, offset: i6
 pub unsafe fn cvt_pwrite64(fd: c_int, buf: *const c_void, count: size_t, offset: i64)
     -> io::Result<ssize_t>
 {
+    use convert::TryInto;
     weak!(fn pwrite64(c_int, *const c_void, size_t, i64) -> ssize_t);
     pwrite64.get().map(|f| cvt(f(fd, buf, count, offset))).unwrap_or_else(|| {
         if let Ok(o) = offset.try_into() {