runtime: fix data sizes for res_search results
runtime: fix data sizes for res_search results

The return values are 32 bit, not 64 bit.

I don't think this would be the cause of any problems, but
it can't hurt to fix it.

Change-Id: Icdd50606360ab9d74070271f9d1721d5fe640bc7
Reviewed-on: https://go-review.googlesource.com/c/go/+/174518
Run-TryBot: Keith Randall <8c99c3a9284e493be632950b84cd789d08ed3e9d@golang.org>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

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