user: implement mlibc as the libc, finally.

It's finally done..

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

user/include/mlibc/options/ansi/musl-generic-math/remainderl.c

@@ -0,0 +1,15 @@
+#include <math.h>
+#include <float.h>
+
+#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
+long double remainderl(long double x, long double y)
+{
+	return remainder(x, y);
+}
+#else
+long double remainderl(long double x, long double y)
+{
+	int q;
+	return remquol(x, y, &q);
+}
+#endif