hgweb: pass a sysstr to low-level _start_response method
This fixes a regression in Python 3 support introduced in 7de7bd407251
on the stable branch. We're so early in do_hgweb that I don't see any
especially better choices than this.
Differential Revision: https://phab.mercurial-scm.org/D3726
{
// Enforcing
"eqeqeq" : true, // true: Require triple equals (===) for comparison
"forin" : true, // true: Require filtering for..in loops with obj.hasOwnProperty()
"freeze" : true, // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
"nonbsp" : true, // true: Prohibit "non-breaking whitespace" characters.
"undef" : true, // true: Require all non-global variables to be declared (prevents global leaks)
// Environments
"browser" : true // Web Browser (window, document, etc)
}