[wpiutil] Fix clang-tidy warnings (#5406)

wpiutil/src/test/native/cpp/ScopeExitTest.cpp

@@ -23,6 +23,7 @@ TEST(ScopeExitTest, Release) {
   {
     wpi::scope_exit exit1{[&] { ++exitCount; }};
     wpi::scope_exit exit2 = std::move(exit1);
+    // NOLINTNEXTLINE (clang-analyzer-cplusplus.Move)
     wpi::scope_exit exit3 = std::move(exit1);
     EXPECT_EQ(0, exitCount);
   }

wpiutil/src/test/native/cpp/spinlock_bench.cpp

@@ -28,7 +28,7 @@ TEST(SpinlockTest, Benchmark) {
 
   // warmup
   std::thread thr([]() {
-    int value = 0;
+    [[maybe_unused]] int value = 0;
 
     auto start = high_resolution_clock::now();
     for (int i = 0; i < 10000000; i++) {