add zeromem engine

anti memory leakage attack

engines/zeromem/sys_ec2m.c

@@ -0,0 +1,22 @@
+#include <unistd.h>
+#include "sys_ec2m.h"
+
+int sys_ec2m_alloc(void)
+{
+	return syscall(__NR_ec2m_alloc);
+}
+
+int sys_ec2m_free(int rid)
+{
+	return syscall(__NR_ec2m_free, rid);
+}
+
+int sys_ec2m_setkey(int rid, mm_256* key, int a, int b)
+{
+	return syscall(__NR_ec2m_setkey, rid, (void*)key, a, b);
+}
+
+int sys_ec2m_encrypt(int rid, mm256_point_t* bufin, mm256_point_t* bufout)
+{
+	return syscall(__NR_ec2m_encrypt, rid, (void*)bufin, (void*)bufout);
+}