glibc: add explicit_bzero() function

Signed-off-by: Waldemar Kozaczuk <jwkozaczuk@gmail.com>

Author: wkozaczuk

Makefile

@@ -1585,6 +1585,7 @@ libc += stdlib/strtod.o
 libc += stdlib/wcstol.o
 
 libc += string/__memcpy_chk.o
+libc += string/explicit_bzero.o
 libc += string/__explicit_bzero_chk.o
 musl += string/bcmp.o
 musl += string/bcopy.o

libc/string/explicit_bzero.c

@@ -0,0 +1,8 @@
+#include <string.h>
+#include <stdlib.h>
+
+void explicit_bzero(void *dest, size_t len)
+{
+    memset(dest, 0, len);
+    return;
+}