shared: add nm_pint_hash()/nm_pint_equals() utils

shared/nm-glib-aux/nm-hash-utils.c

@@ -185,6 +185,26 @@ nm_pstr_equal (gconstpointer a, gconstpointer b)
 	           && nm_streq0 (*s1, *s2));
 }
 
+guint
+nm_pint_hash (gconstpointer p)
+{
+	const int *s = p;
+
+	if (!s)
+		return nm_hash_static (298377461u);
+	return nm_hash_val (1208815757u, *s);
+}
+
+gboolean
+nm_pint_equals (gconstpointer a, gconstpointer b)
+{
+	const int *s1 = a;
+	const int *s2 = a;
+
+	return    s1 == s2
+	       || (s1 && s2 && *s1 == *s2);
+}
+
 guint
 nm_pdirect_hash (gconstpointer p)
 {

shared/nm-glib-aux/nm-hash-utils.h

@@ -278,6 +278,14 @@ gboolean nm_pstr_equal (gconstpointer a, gconstpointer b);
 
 /*****************************************************************************/
 
+/* nm_pint_*() are for hashing keys that are pointers to int values,
+ * that is, "const int *" types. */
+
+guint nm_pint_hash (gconstpointer p);
+gboolean nm_pint_equals (gconstpointer a, gconstpointer b);
+
+/*****************************************************************************/
+
 /* this hashes/compares the pointer value that we point to. Basically,
  * (*((const void *const*) a) == *((const void *const*) b)). */