Clamp comparisons to -1, 0, 1

fca9ae5 "avoid signed overflow" can still cause undefined behavior because
`compare_version_number` can return `INT_MIN` which `version_compare_cb_r`
then tries to negate:

```
../../../../ext/version_sorter/version_sorter.c:94:9: runtime error: negation of -2147483648 cannot be represented in type 'int'; cast to an unsigned type to negate this value to itself
    #0 0x7f9cde1fe1ba in version_compare_cb_r /tmp/x86_64-linux-gnu/version_sorter/2.3.1/../../../../ext/version_sorter/version_sorter.c:94:9
    #1 0x7f9cde75c231  (/lib/x86_64-linux-gnu/libc.so.6+0x39231)
    #2 0x7f9cde75c69e in qsort_r (/lib/x86_64-linux-gnu/libc.so.6+0x3969e)
    #3 0x7f9cde1fd68c in rb_version_sort_1 /tmp/x86_64-linux-gnu/version_sorter/2.3.1/../../../../ext/version_sorter/version_sorter.c:202:2
```

Author: philipturnbull

ext/version_sorter/version_sorter.c

@@ -58,7 +58,7 @@ compare_version_number(const struct version_number *a,
 
 			if (num_a) {
 				int64_t cmp64 = (int64_t)ca->number - (int64_t)cb->number;
-				cmp = (int)max(INT_MIN, min(INT_MAX, cmp64));
+				cmp = (int)max(-1, min(1, cmp64));
 			} else {
 				cmp = strchunk_cmp(
 						a->original, &ca->string,