[Rpm-maint] [rpm-software-management/rpm] RFE: macro for checking endianess (#365)

[Jun Aruga]

@ignatenkobrain I agree with you.
I think showing the little or big endian information by rpm helps the debugging.

I did debug writing below code in a source directly.
I want to check it more casually.

```
+  /*
+  int n = 1;
+  if(*(char *)&n == 1) {
+    printf("debug the system is little endian.\n");
+  } else {
+    printf("debug the system is big endian.\n");
+  }
+  */
```

```
$ lscpu | grep "Byte Order"
Byte Order:          Little Endian
```

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