[libc][NFC] Use #include <math.h> in utils/FPUtil/ManipulationFunct…

…ions.h.

This reverts commit 352cba2.
"add back math.h #include utils/FPUtil/ManipulationFunctions.h".

Using `<math.h>` correct so downstream setup should be fixed.

libc/utils/FPUtil/ManipulationFunctions.h

@@ -13,10 +13,10 @@
 #include "NearestIntegerOperations.h"
 #include "NormalFloat.h"
 
-#include "include/math.h"
 #include "utils/CPP/TypeTraits.h"
 
 #include <limits.h>
+#include <math.h>
 
 namespace __llvm_libc {
 namespace fputil {