[PostGIS] #6112: README.postgis does not document gmp requirement

[PostGIS]

#6112: README.postgis does not document gmp requirement
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  Reporter:  gdt      |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  low      |  Milestone:  PostGIS 3.7.0
 Component:  postgis  |    Version:  master
Resolution:           |   Keywords:
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Description changed by gdt:

Old description:

> Building 3.7.0beta2 under pkgsrc, cmake objects to gmp not being present
> and the build fails.  Reading README.postgis, there's no mention of gmp
> being required, and why it is needed.

New description:

 Building 3.7.0beta2 under pkgsrc, the build objects to gmp not being
 present and the build fails.  Reading README.postgis, there's no mention
 of gmp being required, and why it is needed.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6112#comment:1>
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