/usr/share/gocode/src/code.google.com/p/gcfg is in golang-gopkg-gcfg.v1-dev 0.0~git20150907.0.0ef1a85-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/gocode/src/code.google.com/p/../../gopkg.in/gcfg.v1