Pullup ticket #5241 - requested by sevan
www/serf: build fix

Revisions pulled up:
- www/serf/Makefile                                            1.37

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  Module Name:    pkgsrc
  Committed By:  gdt
  Date:          Tue Apr  4 23:40:06 UTC 2017

  Modified Files:
          pkgsrc/www/serf: Makefile

  Log Message:
  Fix permissions after extraction

  The upstream distfile incorrectly has world-writable files.

(bsiegert)