Pullup ticket #6158 - requested by leot
lang/scala: build fix

Revisions pulled up:
- lang/scala/Makefile                                          1.17

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  Module Name:    pkgsrc
  Committed By:  mef
  Date:          Sat Apr  4 04:19:36 UTC 2020

  Modified Files:
          pkgsrc/lang/scala: Makefile

  Log Message:
  (lang/scala) Fix install stage, ${TAR} was not defined

(bsiegert)