Fix num_macros for syntax/syntax_ext crate split
Fix num_macros for syntax/syntax_ext crate split

DonSheddow/num,rust-lang/num,rust-num/num-bigint,rust-num/num-traits,rust-num/num,koverstreet/num,rust-num/num-bigint,koverstreet/num,vks/num,rust-num/num-integer,DonSheddow/num,rust-lang/num,jbcrail/num,anchovieshat/num,rust-num/num-integer,anchovieshat/num,rust-num/num,vks/num,jbcrail/num,rust-num/num-traits