[PostGIS] #2350: Use NSIS 64-bit for building 64-bit windows package

[PostGIS]

#2350: Use NSIS 64-bit for building 64-bit windows package
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  Reporter:  robe      |      Owner:  robe
      Type:  defect    |     Status:  new
  Priority:  medium    |  Milestone:  PostGIS Fund Me
 Component:  packages  |    Version:  master
Resolution:            |   Keywords:
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Changes (by strk):

 * component:  build => packages

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/2350#comment:3>
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