user: implement mlibc as the libc, finally.

It's finally done..

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

ext2_root/usr/include/sys/auxv.h

@@ -0,0 +1,25 @@
+#ifndef _SYS_AUXV_H
+#define _SYS_AUXV_H
+
+#include <elf.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef __MLIBC_ABI_ONLY
+
+/* mlibc extension: Like getauxval but handles errors in a sane way. */
+/* Success: Return 0. */
+/* Failure: Return -1 and set errno. */
+int peekauxval(unsigned long __type, unsigned long *__value);
+
+unsigned long getauxval(unsigned long __type);
+
+#endif /* !__MLIBC_ABI_ONLY */
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif