Make libc_scudo always go first.

In addition, add Shared_libs to malloc_not_svelte.

Bug: 123689570

Test: Verified that libc_scudo is first wherever it is added.
Change-Id: Ibdc5dbd019a382630a727c270f846aa4446f8d99
Merged-In: Ibdc5dbd019a382630a727c270f846aa4446f8d99