chore: use iwyu on math/**.cpp

math/inv_sqrt.cpp

@@ -8,11 +8,12 @@
  * This algorithm is used to calculate shadows in Quake III Arena.
  */
 
-#include <cassert>   /// for assert
-#include <cmath>     /// for `std::sqrt`
-#include <cstdint>   /// for integral typedefs
-#include <iostream>  /// for IO operations
-#include <limits>    /// for numeric_limits
+#include <cassert>      // for assert
+#include <cmath>        // for fabs, sqrt
+#include <cstdint>      // for int32_t, int64_t
+#include <iostream>     // for basic_ostream, char_traits, operator<<, cout
+#include <type_traits>  // for conditional
+
 /**
  * @brief This is the function that calculates the fast inverse square root.
  * The following code is the fast inverse square root implementation from