build of golang-googlecode-net package fails with gcc-go (checked on s390x in Fedora buildsystem and manually on x86_64) due a linking error

...
+ go test -compiler gccgo -gccgoflags '-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -march=z9-109 -mtune=z10 ' golang.org/x/net/ipv4
# testmain
/tmp/go-build546930784/golang.org/x/net/libipv4.a(_go_.o): In function `golang_org_x_net_ipv4.set.pN28_golang_org_x_net_ipv4.rawOpt':
/builddir/build/BUILDROOT/golang-googlecode-net-0-0.32.gitbc3663d.fc25.s390x/usr/share/gocode/src/golang.org/x/net/ipv4/control.go:18: multiple definition of `golang_org_x_net_ipv4.set.pN28_golang_org_x_net_ipv4.rawOpt'
/tmp/go-build546930784/golang.org/x/net/ipv4/_test/golang.org/x/net/libipv4.a(_go_.o):/builddir/build/BUILDROOT/golang-googlecode-net-0-0.32.gitbc3663d.fc25.s390x/usr/share/gocode/src/golang.org/x/net/ipv4/control.go:18: first defined here
/tmp/go-build546930784/golang.org/x/net/libipv4.a(_go_.o): In function `golang_org_x_net_ipv4.clear.pN28_golang_org_x_net_ipv4.rawOpt':
/builddir/build/BUILDROOT/golang-googlecode-net-0-0.32.gitbc3663d.fc25.s390x/usr/share/gocode/src/golang.org/x/net/ipv4/control.go:19: multiple definition of `golang_org_x_net_ipv4.clear.pN28_golang_org_x_net_ipv4.rawOpt'
/tmp/go-build546930784/golang.org/x/net/ipv4/_test/golang.org/x/net/libipv4.a(_go_.o):/builddir/build/BUILDROOT/golang-googlecode-net-0-0.32.gitbc3663d.fc25.s390x/usr/share/gocode/src/golang.org/x/net/ipv4/control.go:19: first defined here
/tmp/go-build546930784/golang.org/x/net/libipv4.a(_go_.o): In function `golang_org_x_net_ipv4.isset.pN28_golang_org_x_net_ipv4.rawOpt':
/builddir/build/BUILDROOT/golang-googlecode-net-0-0.32.gitbc3663d.fc25.s390x/usr/share/gocode/src/golang.org/x/net/ipv4/control.go:20: multiple definition of `golang_org_x_net_ipv4.isset.pN28_golang_org_x_net_ipv4.rawOpt'
/tmp/go-build546930784/golang.org/x/net/ipv4/_test/golang.org/x/net/libipv4.a(_go_.o):/builddir/build/BUILDROOT/golang-googlecode-net-0-0.32.gitbc3663d.fc25.s390x/usr/share/gocode/src/golang.org/x/net/ipv4/control.go:20: first defined here
/tmp/go-build546930784/golang.org/x/net/libipv4.a(_go_.o): In function `golang_org_x_net_ipv4.ok.pN32_golang_org_x_net_ipv4.genericOpt':
/builddir/build/BUILDROOT/golang-googlecode-net-0-0.32.gitbc3663d.fc25.s390x/usr/share/gocode/src/golang.org/x/net/ipv4/endpoint.go:24: multiple definition of `golang_org_x_net_ipv4.ok.pN32_golang_org_x_net_ipv4.genericOpt'
/tmp/go-build546930784/golang.org/x/net/ipv4/_test/golang.org/x/net/libipv4.a(_go_.o):/builddir/build/BUILDROOT/golang-googlecode-net-0-0.32.gitbc3663d.fc25.s390x/usr/share/gocode/src/golang.org/x/net/ipv4/endpoint.go:24: first defined here
/tmp/go-build546930784/golang.org/x/net/libipv4.a(_go_.o): In function `golang_org_x_net_ipv4.ok.pN30_golang_org_x_net_ipv4.dgramOpt':
/builddir/build/BUILDROOT/golang-googlecode-net-0-0.32.gitbc3663d.fc25.s390x/usr/share/gocode/src/golang.org/x/net/ipv4/endpoint.go:48: multiple definition of `golang_org_x_net_ipv4.ok.pN30_golang_org_x_net_ipv4.dgramOpt'
...

for full log please see http://s390.koji.fedoraproject.org/koji/taskinfo?taskID=2266794

upstream sources for the package is https://github.com/golang/net

Version-Release number of selected component (if applicable):
gcc-go-6.1.1-2.fc24

Steps to reproduce locally:
mkdir -p src/golang.org/x/
cd src/golang.org/x/
git clone https://github.com/golang/net.git
cd ../..
GOPATH=`pwd`/.. go test golang.org/x/net/ipv4