fixing build on non mac systems like linux

[eramitmittal]

When TZ data is updated on linux using grunt data command, zdump output in case of no transition is not to the linking of grunt data-collect task. This fix ensures that usable zdump files get generated even in such cases

[ichernev]

Can you give an example timezone that falls in this? Currently there is this inside collect, but what happens on length 13 is the question ;-) I also added the failed check (previous line).

Now the grunt task works well in the last few IANA releases.

[gilmoreorless]

There were some cross-platform issues with the output of zdump. This solved one of them, but not all. I've done a wider sweep of the zdump-related code in #1059, which should fix this issue as well.