cmd/go: add -Wl,-E to linker flag whitelist (shortcut of --export-dynamic)
cmd/go: add -Wl,-E to linker flag whitelist (shortcut of --export-dynamic)

According to https://linux.die.net/man/1/ld, `-E` is a shortcut of
`--export-dynamic`, it will be better to be added in to whitelist for the
later one has been added in https://golang.org/cl/134016.

Change-Id: I11aa8ea7d86c1c58a2f1dcd258f6f7d2e50861df
GitHub-Last-Rev: 4b1b3676c58406f48fed0571e5353e039f27830d
GitHub-Pull-Request: golang/go#36066
Reviewed-on: https://go-review.googlesource.com/c/go/+/210657
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

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