Update

src/lib/stdarg.h

+#ifndef __LIB_STDARG_H
+#define __LIB_STDARG_H
+
+/* GCC has <stdarg.h> functionality as built-ins,
+   so all we need is to use it. */
+
+typedef __builtin_va_list va_list;
+
+#define va_start(LIST, ARG)	__builtin_va_start (LIST, ARG)
+#define va_end(LIST)            __builtin_va_end (LIST)
+#define va_arg(LIST, TYPE)	__builtin_va_arg (LIST, TYPE)
+#define va_copy(DST, SRC)	__builtin_va_copy (DST, SRC)
+
+#endif /* lib/stdarg.h */