Nomad uses `time.LoadLocation()` to translate a periodic job time zone
string value to a `time.Location`. From godocs:
LoadLocation looks for the IANA Time Zone database in the following locations in order:
* the directory or uncompressed zip file named by the ZONEINFO environment variable
* on a Unix system, the system standard installation location
* $GOROOT/lib/time/zoneinfo.zip
* the time/tzdata package, if it was imported
So non-Unix systems require Go to be installed or `time/tzdata` to be
imported, otherwise running periodic jobs with a specific `time_zone`
value results in an error:
Invalid time zone "America/Toronto": unknown time zone America/Toronto
This commit adds the `timetzdata` build tag on Windows to embed the time
zone data into the final binary. This results in a slightly bigger
binary, but from `time/tzdata` godocs:
Importing this package will increase the size of a program by about 450 KB.
[..]
This package will be automatically imported if you build with -tags timetzdata.
