Fix issue where modifying certain wrapper files would cause failure

The issue was that `git status --porcelain` formats its output in such
a way that `make` no longer passes the variables correctly. The solution
is simply to no longer pass the `git status` data.

Note that the git status data already was not that sufficient in terms
of recognising what changes had been made, since all it provided was
information as to which files had been modified, not how they had been
modified.