adds static libsni (extracted from sniproxy) dependency

.gitmodules

@@ -19,3 +19,6 @@
 [submodule "subprojects/h2o"]
 	path = subprojects/libh2o
 	url = https://github.com/urbit/h2o.git
+[submodule "subprojects/libsni"]
+	path = subprojects/libsni
+	url = https://github.com/urbit/sniproxy

meson.build

@@ -306,6 +306,8 @@ softfloat3_dep = dependency('softfloat3', version: '>=3.0.0', fallback: ['softfl
 libuv_dep = dependency('libuv', version: '>=1.8.0', fallback:['libuv', 'libuv_dep'])
 libh2o_dep = dependency('libh2o', version: '>=0.13.3', fallback: ['libh2o', 'libh2o_dep'])
 
+libsni_dep = dependency('libsni', version: '>=0.5.0', fallback: ['libsni', 'libsni_dep'])
+
 executable('urbit',
 sources : sources,
 include_directories : incdir,
@@ -321,5 +323,6 @@ dependencies: [openssl_dep,
                urbitscrypt_dep,
                ed25519_dep,
                murmur3_dep,
-               softfloat3_dep] + os_deps,
+               softfloat3_dep,
+               libsni_dep] + os_deps,
 install: true)

subprojects/libsni

@@ -0,0 +1 @@
+Subproject commit a59901c38a67660039ee93a6170a338634d76ec0

vere/http.c

@@ -18,7 +18,7 @@
 #include "vere/vere.h"
 
 #include <picohttpparser.h>
-// #include <tls.h>
+#include <tls.h>
 
 static const c3_i TCP_BACKLOG = 16;
 
@@ -1574,7 +1574,8 @@ _proxy_parse_host(const uv_buf_t* buf_u, c3_c** hot_c)
 static u3_proxy_pars
 _proxy_parse_sni(const uv_buf_t* buf_u, c3_c** hot_c)
 {
-  c3_i sas_i = 0; //tls_protocol->parse_packet(buf_u->base, buf_u->len, hot_c);
+  c3_i sas_i = parse_tls_header((const uint8_t*)buf_u->base,
+                                buf_u->len, hot_c);
 
   if ( 0 > sas_i ) {
     switch ( sas_i ) {