user: implement mlibc as the libc, finally.

It's finally done..

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

user/include/mlibc/sysdeps/aero/generic/time.cpp

@@ -0,0 +1,25 @@
+#include <mlibc/all-sysdeps.hpp>
+#include <aero/syscall.h>
+
+namespace mlibc {
+int sys_setitimer(int which, const struct itimerval *new_value,
+                  struct itimerval *old_value) {
+    auto result = syscall(SYS_SETITIMER, which, new_value, old_value);
+
+    if (result < 0) {
+        return -result;
+    }
+
+    return 0;
+}
+
+int sys_getitimer(int which, struct itimerval *curr_value) {
+    auto result = syscall(SYS_GETITIMER, which, curr_value);
+
+    if (result < 0) {
+        return -result;
+    }
+
+    return 0;
+}
+} // namespace mlibc