builder.py: detect overrides by only ctime, not all of struct stat.
builder.py: detect overrides by only ctime, not all of struct stat.

We were accidentally including things like the atime in the comparison,
which is obviously silly; someone reading the file shouldn't mark it as a
manual override.

apenwarr/redo,apenwarr/redo,pombredanne/redo,apenwarr/redo,rowhit/redo,pombredanne/redo,dinkelk/redo-python,pombredanne/redo,dinkelk/redo-python,apenwarr/redo,rowhit/redo,pombredanne/redo,dinkelk/redo-python,rowhit/redo,rowhit/redo,dinkelk/redo-python