Fix some imports and paths

Author: taiki-e

src/libstd/lib.rs

@@ -344,9 +344,6 @@ extern crate unwind;
 // testing gives test-std access to real-std lang items and globals. See #2912
 #[cfg(test)] extern crate std as realstd;
 
-#[cfg(all(target_vendor = "fortanix", target_env = "sgx"))]
-extern crate fortanix_sgx_abi;
-
 // The standard macros that are not built-in to the compiler.
 #[macro_use]
 mod macros;

src/libstd/sys/sgx/abi/usercalls/mod.rs

@@ -22,7 +22,7 @@ pub fn read(fd: Fd, buf: &mut [u8]) -> IoResult<usize> {
 #[unstable(feature = "sgx_platform", issue = "56975")]
 pub fn read_alloc(fd: Fd) -> IoResult<Vec<u8>> {
     unsafe {
-        let userbuf = ByteBuffer { data: ::ptr::null_mut(), len: 0 };
+        let userbuf = ByteBuffer { data: crate::ptr::null_mut(), len: 0 };
         let mut userbuf = alloc::User::new_from_enclave(&userbuf);
         raw::read_alloc(fd, userbuf.as_raw_mut_ptr()).from_sgx_result()?;
         Ok(userbuf.copy_user_buffer())

src/libstd/sys/unix/stack_overflow.rs

@@ -39,7 +39,6 @@ mod imp {
     use libc::{sigaltstack, SIGSTKSZ, SS_DISABLE};
     use libc::{sigaction, SIGBUS, SIG_DFL,
                SA_SIGINFO, SA_ONSTACK, sighandler_t};
-    use libc;
     use libc::{mmap, munmap};
     use libc::{SIGSEGV, PROT_READ, PROT_WRITE, MAP_PRIVATE, MAP_ANON};
     use libc::MAP_FAILED;

src/libstd/sys_common/util.rs

@@ -11,7 +11,7 @@ pub fn dumb_print(args: fmt::Arguments) {
 
 // Other platforms should use the appropriate platform-specific mechanism for
 // aborting the process.  If no platform-specific mechanism is available,
-// ::intrinsics::abort() may be used instead.  The above implementations cover
+// crate::intrinsics::abort() may be used instead.  The above implementations cover
 // all targets currently supported by libstd.
 
 pub fn abort(args: fmt::Arguments) -> ! {