Test some reproducible builds patches from debian.

[mat]

Some more bits from debian.

[mat]

The cf_time variable should be set to something, used in $Config{cf_time} should be set to something so that it doesn't change:

$ perl -V:cf_time
cf_time='Wed Dec 17 22:56:45 UTC 2014';

[swills]

In D2016#5, @mat wrote:

The cf_time variable should be set to something, used in $Config{cf_time} should be set to something so that it doesn't change:

$ perl -V:cf_time
cf_time='Wed Dec 17 22:56:45 UTC 2014';

Set it to the timestamp of the perl distfile?

[mat]

Make more reproducible.

[mat]

Committed in rP383641.