Update clang to version 15

Prerequisite: isc-projects/images!194

Things to address first:

• #3532 (closed)
• #3531 (closed)
• !7117 (merged)

There are two types of formatting changes:

@@ -205,7 +205,8 @@ checkns(dns_zone_t *zone, const dns_name_t *name, const dns_name_t *owner,
                 */
                cur = ai;
                while (cur != NULL && cur->ai_canonname == NULL &&
-                      cur->ai_next != NULL) {
+                      cur->ai_next != NULL)
+               {
                        cur = cur->ai_next;
                }
                if (cur != NULL && cur->ai_canonname != NULL &&

@@ -137,7 +137,7 @@ static struct cc {
        struct cc *next;
        int rdclass;
        char classbuf[TYPECLASSBUF];
-} * classes;
+} *classes;
 
 static struct tt {
        struct tt *next;