Don't use lld linker with memcheck
Don't use lld linker with memcheck

The switch to lld caused many new violations.
The ones for MSan are being handled upstream: crbug.com/772559
But memcheck is unlikely to be supported.

BUG=webrtc:8356
TBR=kjellander@webrtc.org

Change-Id: I6b728b7d689a1d883fc6e49eb438336bda08afe1
Reviewed-on: https://webrtc-review.googlesource.com/7080
Commit-Queue: Oleh Prypin <5baa3e04f9bd6ba7a2a4b56625a3c84f19237cdb@webrtc.org>
Reviewed-by: Oleh Prypin <5baa3e04f9bd6ba7a2a4b56625a3c84f19237cdb@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#20195}
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