Revert "[scudo] Check if MADV_DONTNEED zeroes memory"

This reverts commit d423509b8036c29bbf94dab192d12097555ce0f8.

We are going to use patched QEMU.

GitOrigin-RevId: 4458e8c4b42f3ebd44f909ffc0836224b7141d2e
Change-Id: I3a2629abaddeaca6e6290223a51ddcac41d799de
1 file changed