emulators/qemu-user-static: update to d618de655

Primarily fixes qemu-user-static with the upstream switch to enabling
ARM_FEATURE_EL3 by default (I note that this actually eventually gets
reverted on its own just for CONFIG_USER in later revisions of qemu).

It also fixes some really fundamental breakage that was observed in, e.g.,
grep and most other applications. The official armv7 builder, beefy12, was
seeing an incredibly similar failure.