user: implement mlibc as the libc, finally.

It's finally done..

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

user/include/mlibc/options/linux/generic/sys-klog.cpp

@@ -0,0 +1,16 @@
+#include <errno.h>
+#include <sys/klog.h>
+
+#include <bits/ensure.h>
+
+#include <mlibc/linux-sysdeps.hpp>
+
+int klogctl(int type, char *bufp, int len) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_klogctl, -1);
+	int out;
+	if (int e = mlibc::sys_klogctl(type, bufp, len, &out); e) {
+		errno = e;
+		return -1;
+	}
+	return out;
+}