fix math.frexp function signature (#16725)

changelog.md

@@ -113,10 +113,9 @@ with other backends. see #9125. Use `-d:nimLegacyJsRound` for previous behavior.
 
 - Added `sugar.dumpToString` which improves on `sugar.dump`.
 
-
-
 - Added `math.signbit`.
 
+
 - Removed the optional `longestMatch` parameter of the `critbits._WithPrefix` iterators (it never worked reliably)
 - In `lists`: renamed `append` to `add` and retained `append` as an alias;
   added `prepend` and `prependMoved` analogously to `add` and `addMoved`;
@@ -147,6 +146,8 @@ provided by the operating system.
   issues like https://github.com/nim-lang/Nim/issues/13063 (which affected error messages)
   for modules importing `std/wrapnils`.
 
+- Added `math.frexp` overload procs. Deprecated `c_frexp`, use `frexp` instead.
+
 - `parseopt.initOptParser` has been made available and `parseopt` has been
   added back to `prelude` for all backends. Previously `initOptParser` was
   unavailable if the `os` module did not have `paramCount` or `paramStr`,