Get rid of #[deny(warnings)]

This is considered harmful as the warnings may change with any compiler
release.

Signed-off-by: Daniel Egger <[email protected]>

Author: therealprof

cortex-m-rt/macros/src/lib.rs

@@ -2,8 +2,6 @@
 //!
 //! Do not use this crate directly.
 
-#![deny(warnings)]
-
 extern crate proc_macro;
 
 use proc_macro::TokenStream;

cortex-m-rt/src/lib.rs

@@ -401,7 +401,6 @@
 // here will appear in the linker script (`link.x`) in conjunction with the `KEEP` command.
 
 #![deny(missing_docs)]
-#![deny(warnings)]
 #![no_std]
 
 extern crate cortex_m_rt_macros as macros;