Remove labels in libstd/lib.rs macro imports
Remove labels in libstd/lib.rs macro imports

These labels were probably moved around when rustfmt was introduced.

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