package: hide golang packages for toolchains with binutils bug 20006

Fixes:
    http://autobuild.buildroot.org/results/020/02039969b16534d4020ecd4574bae71b91c1e6b8/ (flannel)
    http://autobuild.buildroot.org/results/e95/e9528b06b350ef84c1e2cb59fba87b4db77b4660/

 (docker-engine)
    [...]

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>