cmd/link/internal/ld/lib.go: use lld on Android

Set linker explicitly to lld because the default does not work on NDK
versions r19c, r20, r20b and r21. NDK 18b (or earlier) based builds
will need to specify -fuse-ld=gold.

Fixes #38838

Change-Id: Ib75f71fb9896b843910f41bd12aa1e36868fa9b3
GitHub-Last-Rev: eeaa171604b59d8ad3d86944ebf21ee758e92f95
GitHub-Pull-Request: golang/go#39217
Reviewed-on: https://go-review.googlesource.com/c/go/+/235017


Reviewed-by: Elias Naur <mail@eliasnaur.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Elias Naur <mail@eliasnaur.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>