this will help ensure that upstreams apply as cleanly as it does manually
the filtering makes the patches more fragile, but usually not an issue for small updates.
this will unfilter, apply the cleanest patches, then the next rebuild will
filter out unnecessary changes
Instead of checking whether it was set previously, setting it to false,
then setting it back to true if it was true before, just use the
command-line argument in git to override the config for that command.
Using a variable makes it pretty painless to do.
