user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/options/ansi/generic/complex/cabs.c

@@ -0,0 +1,59 @@
+/* $NetBSD: cabs.c,v 1.1 2007/08/20 16:01:30 drochner Exp $ */
+
+/*
+ * Written by Matthias Drochner <drochner@NetBSD.org>.
+ * Public domain.
+ *
+ * imported and modified include for newlib 2010/10/03 
+ * Marco Atzeri <marco_atzeri@yahoo.it>
+ */
+
+/*
+FUNCTION
+        <<cabs>>, <<cabsf>>, <<cabsl>>---complex absolute-value
+
+INDEX
+        cabs
+INDEX
+        cabsf
+INDEX
+        cabsl
+
+SYNOPSIS
+       #include <complex.h>
+       double cabs(double complex <[z]>);
+       float cabsf(float complex <[z]>);
+       long double cabsl(long double complex <[z]>);
+
+
+DESCRIPTION
+        These functions compute compute the complex absolute value 
+        (also called norm, modulus, or magnitude) of <[z]>. 
+
+        <<cabsf>> is identical to <<cabs>>, except that it performs
+        its calculations on <<float complex>>.
+
+        <<cabsl>> is identical to <<cabs>>, except that it performs
+        its calculations on <<long double complex>>.
+
+RETURNS
+        The cabs* functions return the complex absolute value.
+
+PORTABILITY
+        <<cabs>>, <<cabsf>> and <<cabsl>> are ISO C99
+
+QUICKREF
+        <<cabs>>, <<cabsf>> and <<cabsl>> are ISO C99
+
+*/
+
+
+#include <complex.h>
+#include <math.h>
+
+double
+cabs(double complex z)
+{
+
+	return hypot( creal(z), cimag(z) );
+}