LibM: Define math_errhandling and associated macros

Author: https://github.com/RealKC
Commit: 70737b42b2
Pull-request: https://github.com/SerenityOS/serenity/pull/5688
Issue: https://github.com/SerenityOS/serenity/issues/4282
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/BenWiederhake
Reviewed-by: https://github.com/awesomekling

Userland/Libraries/LibM/math.h

@@ -36,6 +36,10 @@
 
 __BEGIN_DECLS
 
+#define MATH_ERRNO 1
+#define MATH_ERREXCEPT 2
+#define math_errhandling MATH_ERREXCEPT
+
 #define HUGE_VAL 1e10000
 #define INFINITY __builtin_huge_val()
 #define NAN __builtin_nan("")