Up to 1.4.70

Up to 1.4.70

- https://redmine.lighttpd.net/projects/lighttpd/wiki/Release-1_4_70

Important changes from 1.4.69
- speed up CGI spawning
- native Windows build (experimental) (not packaged; no installer)
- support HTTP/2 downstream proxy serving multiple clients on single connection (mod_extforward, mod_maxminddb)
- restructure code to isolate HTTP/2

Behavior Changes (previously announced):
- no longer building separate modules for built-in modules
- lighttpd 1.4.70 omits building separate (unused) modules for:
mod_access mod_alias mod_evhost mod_expire mod_fastcgi mod_indexfile
mod_redirect mod_rewrite mod_scgi mod_setenv mod_simple_vhost
mod_staticfile