runtime: remove unused __vdso_time_sym
runtime: remove unused __vdso_time_sym

It's unused since https://golang.org/cl/99320043

Change-Id: I74d69ff894aa2fb556f1c2083406c118c559d91b
Reviewed-on: https://go-review.googlesource.com/98195
Run-TryBot: Tobias Klauser <0a68dd4915066ec5d3f81f75a828fee53dcc8822@gmail.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

codestation/go,cloudflare/go,CAFxX/go,codestation/go,Cofyc/go,CAFxX/go,codestation/go,Cofyc/go,akutz/go,cloudflare/go,cloudflare/go,akutz/go,golang/go,Cofyc/go,josharian/go,golang/go,cloudflare/go,codestation/go,nawawi/go,codestation/go,golang/go,codestation/go,nawawi/go,nawawi/go,josharian/go,codestation/go,nawawi/go,golang/go,josharian/go,CAFxX/go,josharian/go,akutz/go,nawawi/go,golang/go,Cofyc/go,codestation/go,Cofyc/go,akutz/go,cloudflare/go,CAFxX/go,golang/go,nawawi/go,CAFxX/go,Cofyc/go,nawawi/go,Cofyc/go,CAFxX/go,akutz/go,cloudflare/go,Cofyc/go,cloudflare/go,nawawi/go,josharian/go,CAFxX/go,golang/go,josharian/go,akutz/go,josharian/go,CAFxX/go,golang/go,akutz/go,josharian/go,akutz/go,cloudflare/go