[release-branch.go1.21] cmd/link: don't generate DYSYMTAB when external linking on Mach-O
When external linking, the external linker will generate it.
Updates #60694.
For #61229.
Change-Id: I086a7628dd9baa84b46315641746fc3640473f2b
Reviewed-on: https://go-review.googlesource.com/c/go/+/502617
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
(cherry picked from commit
f55e7e104bbef911f1495b39c3c2ff366ad3be4d)
Reviewed-on: https://go-review.googlesource.com/c/go/+/513757