[scudo][standalone] Match function name change to bionic name change.

Summary: Bionic was modified to have all function names consistent. Modify the code and get rid of the special case for bionic since it's no longer needed.

Reviewers: cryptoad

Reviewed By: cryptoad

Subscribers: srhines, llvm-commits, #sanitizers

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D70031