nix: fix nix-store-tests-run for static builds

The test runner's buildInputs (writableTmpDirAsHomeHook, openssl)
need to be nativeBuildInputs. In the static (cross-musl) build,
strictDeps is enabled and only nativeBuildInputs are added to PATH.
With buildInputs, openssl was not in PATH, causing
HttpsBinaryCacheStoreTest.queryPathInfo to crash.

pkgs/tools/package-management/nix/modular/src/libstore-tests/package.nix

@@ -62,10 +62,10 @@ mkMesonExecutable (finalAttrs: {
         runCommand "${finalAttrs.pname}-run"
           {
             meta.broken = !stdenv.hostPlatform.emulatorAvailable buildPackages;
-            buildInputs = [
+            nativeBuildInputs = [
               writableTmpDirAsHomeHook
             ]
-            ++ lib.optional (lib.versionAtLeast version "2.34pre") openssl;
+            ++ lib.optional (lib.versionAtLeast version "2.34pre") (lib.getBin openssl);
           }
           ''
             export _NIX_TEST_UNIT_DATA=${data + "/src/libstore-tests/data"}