Bug#1098409: nsnake FTCBFS: links with the build architecture compiler during make install

[Helmut Grohne]

Source: nsnake
Version: 3.0.1-2.2
Tags: patch upstream
User: debian-cross at lists.debian.org
Usertags: ftcbfs

nsnake fails to cross build from source, because it fails linking with
the build architecture compiler. It actually attempts to link twice. It
successfully links during dh_auto_build and then in dh_auto_install, it
links again, but there debhelper does not pass cross tools. The cause is
that the Makefile targets do not accurately match files. I'm proposing
the attached patch to fix that.

Helmut