[pkg-go] Bug#793829: gocode: fails to build with Go 1.5

[Michael Hudson-Doyle]

Source: gocode
Version: 20150303-2
Severity: normal

Dear Maintainer,

The package fails to build with Go 1.5 because debian/rules appears to think
make is shell and sets GOPATH to '`pwd`'. Go 1.5 is stricter about detecting
bogus GOPATH values and the build fails. The fix is to remove chunks of
debian/rules and have dh-golang do more of the work.

-- System Information:
Debian Release: jessie/sid
  APT prefers vivid-updates
  APT policy: (500, 'vivid-updates'), (500, 'vivid-security'), (500, 'vivid'), (100, 'vivid-backports')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.19.0-23-generic (SMP w/4 CPU cores)
Locale: LANG=en_NZ.UTF-8, LC_CTYPE=en_NZ.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)