hgweb: pass a sysstr to low-level _start_response method...
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