Correction for the fix for Bug 3508 - Persistent storage support breaks Linux compatibility.
A 2nd `make install' will fail attempting to create symlink libnvmemmory.so already created by 1st install.
Install should pre-emptively delete it.
#include <stdio.h>
#define __swi
#include "oslib/osfile.h"
long PyOS_GetLastModificationTime(char *path, FILE *fp)
{
int obj;
bits load, exec, ftype;
if (xosfile_read_stamped_no_path(path, &obj, &load, &exec, 0, 0, &ftype)) return -1;
if (obj != osfile_IS_FILE) return -1;
if (ftype == osfile_TYPE_UNTYPED) return -1;
load &= 0xFF;
load -= 51;
if (exec < 1855548004U) load--;
exec -= 1855548004U;
return exec/100+42949672*load+(95*load)/100;
}