Update ArchGDAL and SimpleSDMLayers for mac failures.

[claireh93]

Can't merge until JuliaData/IndexedTables.jl#297 has gone through

UPDATE: Rolled back mac version to a point where it works while we wait.

[coveralls]

Pull Request Test Coverage Report for Build 3000020563

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 72.319%

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Totals
Change from base Build 2775373934:	0.0%
Covered Lines:	2448
Relevant Lines:	3385

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💛 - Coveralls

[codecov]

Codecov Report

Base: 80.18% // Head: 80.18% // No change to project coverage 👍

Coverage data is based on head (dccea2a) compared to base (f358287).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev      #96   +/-   ##
=======================================
  Coverage   80.18%   80.18%           
=======================================
  Files          44       44           
  Lines        2781     2781           
=======================================
  Hits         2230     2230           
  Misses        551      551           

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