chore(morestyle) adapt spacing rule to multi-line wrapped expressions

Accommodating the case when an expression following a variable
declaration is wrapped into multiple lines, e.g.:

size_t size = sizeof(ngx_wa_metrics_histogram_t)
              + sizeof(ngx_wa_metrics_bin_t)
              * metrics->config.max_histogram_bins;

util/morestyle.pl

@@ -202,6 +202,8 @@
                     $var_line = $line;
                     save_var();
 
+                } elsif ($line =~ /^\s+[\+\-\*\/] [\s\w\(\)\+\-\*\/\.\-\>]/) {
+                    # ignoring line with a portion of a wrapped expression
                 } elsif (!$cur_line_is_empty) {
                     if ($n_vars > 0 && $min_var_space - $max_var_type > 3) {
                         var_output "excessive spacing in variable alignment: needs 2 spaces from longest type to first name/pointer.";