Fix [-Wimplicit-fallthrough] warnings in PHPDBG SAPI

Author: Girgias

sapi/phpdbg/phpdbg_cmd.c

@@ -258,7 +258,7 @@ PHPDBG_API zend_bool phpdbg_match_param(const phpdbg_param_t *l, const phpdbg_pa
 					if (l->num != r->num) {
 						break;
 					}
-				/* break intentionally omitted */
+				fallthrough;
 
 				case STR_PARAM:
 					return (l->len == r->len) &&
@@ -288,7 +288,7 @@ PHPDBG_API zend_bool phpdbg_match_param(const phpdbg_param_t *l, const phpdbg_pa
 					if (l->num != r->num) {
 						break;
 					}
-				/* break intentionally omitted */
+				fallthrough;
 
 				case METHOD_PARAM: {
 					size_t lengths[2] = {

sapi/phpdbg/phpdbg_out.c

@@ -305,6 +305,7 @@ static int format_converter(register buffy *odp, const char *fmt, zend_bool esca
 						fmt++;
 					}
 					/* these are promoted to int, so no break */
+					fallthrough;
 				default:
 					modifier = LM_STD;
 					break;
@@ -755,6 +756,7 @@ static int format_converter(register buffy *odp, const char *fmt, zend_bool esca
 					 * Note that we can't point s inside fmt because the
 					 * unknown <char> could be preceded by width etc.
 					 */
+				fallthrough;
 				default:
 					char_buf[0] = '%';
 					char_buf[1] = *fmt;

sapi/phpdbg/phpdbg_watch.c

@@ -133,6 +133,8 @@ zend_bool phpdbg_check_watch_diff(phpdbg_watchtype type, void *oldPtr, void *new
 			if (memcmp(&((Bucket *) oldPtr)->h, &((Bucket *) newPtr)->h, sizeof(Bucket) - sizeof(zval) /* key/val comparison */) != 0) {
 				return 2;
 			}
+			/* TODO: Is this intentional? */
+			fallthrough;
 		case WATCH_ON_ZVAL:
 			return memcmp(oldPtr, newPtr, sizeof(zend_value) + sizeof(uint32_t) /* value + typeinfo */) != 0;
 		case WATCH_ON_HASHTABLE: