Latest master gives error when building std for unsupported

[Ayush1325]

The latest master: 4104596 gives error when trying to build std for x86_64-unknown-uefi

The error I get is the following:

error: `sys_common::condvar::Condvar::new` is not yet stable as a const fn
   --> /var/home/ayush/Documents/Programming/Rust/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/src/rust/library/std/src/sync/condvar.rs:129:26
    |
129 |         Condvar { inner: sys::Condvar::new() }
    |                          ^^^^^^^^^^^^^^^^^^^
    |
    = help: const-stable functions can only call other const-stable functions

error: `sys_common::mutex::MovableMutex::new` is not yet stable as a const fn
   --> /var/home/ayush/Documents/Programming/Rust/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/src/rust/library/std/src/sync/mutex.rs:220:20
    |
220 |             inner: sys::MovableMutex::new(),
    |                    ^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: const-stable functions can only call other const-stable functions

error: `sys_common::rwlock::MovableRwLock::new` is not yet stable as a const fn
   --> /var/home/ayush/Documents/Programming/Rust/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/src/rust/library/std/src/sync/rwlock.rs:153:20
    |
153 |             inner: sys::MovableRwLock::new(),
    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: const-stable functions can only call other const-stable functions

error: could not compile `std` due to 3 previous errors

I am currently working on porting Rust std to UEFI. Previously was using a week-old master and decided to rebase today. However, not sure how to fix this error which showed up after rebase.

After looking at previous commits, the culprit seems to be edae495