Remove an unnecessary 'static bound in the impl of Debug for Mutex.
Remove an unnecessary 'static bound in the impl of Debug for Mutex.

There is no reason to require T: 'static; the bound appears to be
a historical artifact.

GBGamer/rust,GBGamer/rust,graydon/rust,GBGamer/rust,GBGamer/rust,graydon/rust,aidancully/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,GBGamer/rust