cmd/link: Revert -buildmode=pie to internal linking
cmd/link: Revert -buildmode=pie to internal linking

When internal linking was broken buildmode PIE is set to external
linking. Now internal linking is fixed, -buildmode=pie can default to
internal linking again.

Fixes #35545

Change-Id: Iaf86b3047eb76babebc1545a79125586a7a3980e
Reviewed-on: https://go-review.googlesource.com/c/go/+/207877
Run-TryBot: Cherry Zhang <d62e63aa42ce272d7b6a5055d97e942b33a34679@google.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Cherry Zhang <d62e63aa42ce272d7b6a5055d97e942b33a34679@google.com>

golang/go,nawawi/go,golang/go,akutz/go,nawawi/go,cloudflare/go,cloudflare/go,cloudflare/go,CAFxX/go,nawawi/go,golang/go,cloudflare/go,CAFxX/go,cloudflare/go,nawawi/go,akutz/go,golang/go,golang/go,CAFxX/go,akutz/go,akutz/go,akutz/go,CAFxX/go,golang/go,CAFxX/go,golang/go,cloudflare/go,cloudflare/go,akutz/go,CAFxX/go,akutz/go,golang/go,akutz/go,nawawi/go,CAFxX/go,nawawi/go,nawawi/go,cloudflare/go,CAFxX/go,nawawi/go