Doctest failure on powerpc64

[r-burns]

I'm running into this error during doctests:

doctests: loadObj "/nix/store/lzvinhlmw6l0ywb68zazzxsd3jcx6cm9-ghc-8.10.2/lib/ghc-8.10.2/ghc-prim-0.6.1/HSghc-prim-0.6.1.o": failed

I suspect this is due to lack of RTS support on ppc64, if I understand this warning correctly:

Test suite doctests: RUNNING...
doctests: /nix/store/lzvinhlmw6l0ywb68zazzxsd3jcx6cm9-ghc-8.10.2/lib/ghc-8.10.2/ghc-prim-0.6.1/HSghc-prim-0.6.1.o: RTS linker not implemented on PowerPC 64-bit
doctests: /nix/store/lzvinhlmw6l0ywb68zazzxsd3jcx6cm9-ghc-8.10.2/lib/ghc-8.10.2/ghc-prim-0.6.1/HSghc-prim-0.6.1.o: RTS linker not implemented on PowerPC 64-bit

The other tests seem to pass okay, and I haven't run into issues with other Haskell packages that depend on swagger2, so maybe this test should be skipped on platforms without RTS support?

Full test log:

Test suite doctests: RUNNING...
doctests: /nix/store/lzvinhlmw6l0ywb68zazzxsd3jcx6cm9-ghc-8.10.2/lib/ghc-8.10.2/ghc-prim-0.6.1/HSghc-prim-0.6.1.o: RTS linker not implemented on PowerPC 64-bit
doctests: /nix/store/lzvinhlmw6l0ywb68zazzxsd3jcx6cm9-ghc-8.10.2/lib/ghc-8.10.2/ghc-prim-0.6.1/HSghc-prim-0.6.1.o: RTS linker not implemented on PowerPC 64-bit
-i
-i/build/swagger2-2.6/dist/build/autogen
-i/build/swagger2-2.6/dist/build
-i/build/swagger2-2.6/src
-I/build/swagger2-2.6/include
-I/nix/store/c1a4g5c69w0rlnq1bflzhsysf8x7zj1j-llvm-9.0.1/include
-I/nix/store/9yp4kyi3ygyf55a5b45253mx5fd6ay9h-ncurses-6.2-dev/include
-I/nix/store/97iajgn0rq9mikjph2n8rpmhd7w3m35y-zlib-1.2.11-dev/include
-package-env=-
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Data.Swagger
Data.Swagger.Declare
Data.Swagger.Lens
Data.Swagger.Operation
Data.Swagger.Optics
Data.Swagger.ParamSchema
Data.Swagger.Schema
Data.Swagger.Schema.Generator
Data.Swagger.Schema.Validation
Data.Swagger.SchemaOptions
Data.Swagger.Internal
Data.Swagger.Internal.Schema
Data.Swagger.Internal.Schema.Validation
Data.Swagger.Internal.ParamSchema
Data.Swagger.Internal.Utils
Data.Swagger.Internal.AesonUtils
Data.Swagger.Internal.TypeShape
doctests: loadObj "/nix/store/lzvinhlmw6l0ywb68zazzxsd3jcx6cm9-ghc-8.10.2/lib/ghc-8.10.2/ghc-prim-0.6.1/HSghc-prim-0.6.1.o": failed
Test suite doctests: FAIL
Test suite logged to: dist/test/swagger2-2.6-doctests.log