Add tests for PoCL with and without using icd

test/compilers/opencl-run.nix

@@ -0,0 +1,31 @@
+{
+  stdenv,
+  clang-ompss2,
+  nanos6,
+}:
+
+stdenv.mkDerivation {
+  version = "0.0.1";
+  name = "test-clang-ompss2";
+  src = ./.;
+  buildInputs = [
+    clang-ompss2
+    nanos6
+  ];
+
+  env = {
+    # NIX_DEBUG = 1;
+    OCL_ICD_VENDORS = "";
+  };
+
+  buildPhase = ''
+    clang -fompss-2 hello.c -o hello
+    ./hello
+    clang++ -fompss-2 hello.cc -o hello
+    ./hello
+  '';
+
+  installPhase = ''
+    mkdir -p $out
+  '';
+}