Fix CI

Author: Bodigrim

.github/workflows/ci.yml

@@ -49,6 +49,7 @@ jobs:
         cd bytestring-*/
         cabal bench --enable-tests --enable-benchmarks --benchmark-option=-l all
     - name: Haddock
+      if: matrix.ghc != '8.4'
       run: |
         cd bytestring-*/
         cabal haddock all

bytestring.cabal

@@ -232,6 +232,10 @@ test-suite bytestring-tests
   if !arch(wasm32)
     ghc-options:    -threaded
 
+  -- https://github.com/haskellari/splitmix/issues/101
+  if os(openbsd)
+    build-depends: splitmix < 0.1.3.1 || > 0.1.3.1
+
 benchmark bytestring-bench
   import:           language
   main-is:          BenchAll.hs