fix r3218:

Initially building lists of ports, addresses, and server names had been
placed at final configuration stage, because complete set of the "listen"s
and the "server_names" were required for this operation. r3218 broke it,
because the "listen"s go usually first in configuration, and
cscf->server_names is empty at this stage, therefore no virtual names
were configured.

Now server configurations are stored in array for each address:port
to configure virtual names. Also regex captures flag is moved from
server names to core server configuration.
diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index a9e9495..a8c33f1 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -2876,7 +2876,6 @@
 
 #if (NGX_PCRE)
         sn->regex = NULL;
-        sn->captures = 0;
 #endif
         sn->core_srv_conf = conf;
         sn->name.len = conf->server_name.len;
@@ -3529,11 +3528,12 @@
 
 #if (NGX_PCRE)
         sn->regex = NULL;
-        sn->captures = 0;
 #endif
         sn->core_srv_conf = cscf;
         sn->name = value[i];
 
+        ngx_strlow(sn->name.data, sn->name.data, sn->name.len);
+
         if (value[i].data[0] != '~') {
             continue;
         }
@@ -3562,8 +3562,8 @@
             return NGX_CONF_ERROR;
         }
 
-        sn->captures = (ngx_regex_capture_count(sn->regex) > 0);
         sn->name = value[i];
+        cscf->captures = (ngx_regex_capture_count(sn->regex) > 0);
         }
 #else
         ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,