Fix test

Author: hamishmack

test/project-flags/test-project-flags.cabal

@@ -22,7 +22,8 @@ executable test-project-flags-exe
   main-is:           Main.hs
   build-depends:     base >=4.7 && <5, test-project-flags
   hs-source-dirs:    app
-  ghc-options:       -threaded -rtsopts -with-rtsopts=-N
+  if !arch(wasm32)
+    ghc-options:       -threaded -rtsopts -with-rtsopts=-N
   default-language:  Haskell2010
   if flag(test-flag)
     cpp-options: -DTEST_FLAG