user: implement mlibc as the libc, finally.

It's finally done..

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

user/include/mlibc/options/glibc/generic/personality.cpp

@@ -0,0 +1,15 @@
+#include <bits/ensure.h>
+#include <errno.h>
+#include <mlibc/glibc-sysdeps.hpp>
+#include <sys/personality.h>
+
+int personality(unsigned long persona) {
+	int out = 0;
+	auto sysdep = MLIBC_CHECK_OR_ENOSYS(mlibc::sys_personality, -1);
+
+	if(int e = sysdep(persona, &out); e) {
+		errno = e;
+		return -1;
+	}
+	return out;
+}