Tests: fixed server_tokens tests for build names with spaces.

Build names can contain spaces, and previously used pattern, "--build=(\S+)",
failed to properly match such build names.  Instead, now we simply test
that some build name is provided in the Server header and error pages.
Further, the $t->has_module() method is now used to check if a build name
is set instead of directly testing the $t->{_configure_args} internal field.

Author: mdounin

h2_server_tokens.t

@@ -106,7 +106,7 @@ like(header_server('/on/200'), qr/^$re$/, 'http2 tokens on 200');
 like(header_server('/on/404'), qr/^$re$/, 'http2 tokens on 404');
 like(body('/on/404'), $re, 'http2 tokens on 404 body');
 
-$re = qr/$re \Q($1)\E/ if $t->{_configure_args} =~ /--build=(\S+)/;
+$re = qr/$re \(.*\)/ if $t->has_module('--build=');
 
 like(header_server('/b/200'), qr/^$re$/, 'http2 tokens build 200');
 like(header_server('/b/404'), qr/^$re$/, 'http2 tokens build 404');

server_tokens.t

@@ -105,7 +105,7 @@ like(http_get_server('/on/200'), $re, 'tokens on 200');
 like(http_get_server('/on/404'), $re, 'tokens on 404');
 like(http_body('/on/404'), $re, 'tokens on 404 body');
 
-$re = qr/$re \Q($1)\E/ if $t->{_configure_args} =~ /--build=(\S+)/;
+$re = qr/$re \(.*\)/ if $t->has_module('--build=');
 
 like(http_get_server('/b/200'), $re, 'tokens build 200');
 like(http_get_server('/b/404'), $re, 'tokens build 404');