ecore_file: add case to properly rename a file in Windows

Summary:
If the file with a new path was created and 'rename' wants to replace the old path to the new path. 'rename' will return:
   Windows 7: -1 (errno=EEXIST) (EEXIST == 17)
   Ubuntu: 0

**EEXIST**
**Ubuntu**: The link named by new is a directory that is not an empty directory. (https://linux.die.net/man/3/rename)
**Windows 7**: Files exist. An attempt has been made to create a file that already exists. For example, the _O_CREAT and _O_EXCL flags are specified in an _open call, but the named file already exists.(https://msdn.microsoft.com/en-us/library/5814770t.aspx)

Test Plan:
**Sample code to rename in Linux and Windows if the file with the new name already exists:**

int main()
{
	const char *_old = "old";
	const char *_new = "new";

	int fd1 = open(_old, O_CREAT);
	close(fd1);
	int fd2 = open(_new, O_CREAT);
	close(fd2);
	printf("rename:\t%s -> %s\n", _old, _new);
	int r = rename(_old, _new);
	if (r == 0)
	{
		printf("GOOD\n");
	}
	else
	{
		printf("CODE ERROR:\n"                  );
		printf(" -rename...: %d\n", r    );
		printf(" -errno....: %d\n", errno);
	}
	return 0;
}

Reviewers: raster, vtorri, jpeg, NikaWhite, reutskiy.v.v, an.kroitor, cedric

Reviewed By: cedric

Subscribers: artem.popov, cedric, jpeg

Tags: #efl, #windows

Differential Revision: https://phab.enlightenment.org/D4561

Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>

src/lib/ecore_file/ecore_file.c

@@ -508,6 +508,21 @@ ecore_file_mv(const char *src, const char *dst)
                   goto PASS;
                }
           }
+#ifdef _WIN32
+          if (errno == EEXIST)
+            {
+               struct _stat s;
+               _stat(dst, &s);
+               if (_S_IFREG & s.st_mode)
+               {
+                  ecore_file_unlink(dst);
+                  if (rename(src, dst))
+                    {
+                       return EINA_TRUE;
+                    }
+               }
+            }
+#endif
         goto FAIL;
      }