[pkg-go] Bug#907263: dh-golang: Failed to build with gccgo-8

[Shengjing Zhu]

Package: dh-golang
Severity: important
Tags: patch

Dear Maintainer,

dh-golang failed to build with gccgo-8.

   dh_golang -O--buildsystem=golang
	"go list -f '{{ range .Deps }}{{.}}\
{{ end }}'" github.com/elves/elvish [...]
	"go list -f '\\\
{{ .Dir }}/{{ index (or .GoFiles .CgoFiles .TestGoFiles .XTestGoFiles .IgnoredGoFiles) 0 }}'" bufio bytes [...]
template: main:2:14: executing "main" at <index (or .GoFiles ....>: error calling index: index out of range: 0
dh_golang: go list -f '\
{{ .Dir }}/{{ index (or .GoFiles .CgoFiles .TestGoFiles .XTestGoFiles .IgnoredGoFiles) 0 }}' returned exit code 1
make: *** [debian/rules:18: binary] Error 1
dpkg-buildpackage: error: fakeroot debian/rules binary subprocess returned exit status 2

The reason is that since gccgo-8, `go list {{ .Deps }}` will return
standard library. But it can't return the source files for standard
library. So the template will execute things like `index [] 0`.

Patch is attached.

-- 
Best regards,
Shengjing Zhu
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