windows: Unicode and IPv6 http/sockets

cleanup schannel implementation (drop NT4.0 compatibility, use unicode strings, etc)
restore http tests
fix socket test: it did not throw before

vlib/http/backend_nix.v

@@ -28,14 +28,7 @@ struct C.SSL {
 } 
 
 fn init() int {
-	$if mac { 
-		C.SSL_library_init() 
-	} 
-	$if linux { 
-		C.SSL_library_init() 
-	} 
-	//C.SSL_load_error_strings() 
-	//C.OPENSSL_config(0) 
+	C.SSL_library_init() 
 	return 1
 }
 

vlib/http/backend_win.v

@@ -8,6 +8,7 @@ module http
 #flag windows -I @VROOT/thirdparty/vschannel
 #flag -l ws2_32
 #flag -l crypt32
+#flag -l secur32
  
 #include "vschannel.c"
 
@@ -22,7 +23,7 @@ fn (req &Request) ssl_do(port int, method, host_name, path string) Response {
 	mut buff := malloc(C.vsc_init_resp_buff_size)
 	addr := host_name
 	sdata := req.build_request_headers(method, host_name, path)
-	length := int(C.request(&ctx, port, addr.str, sdata.str, &buff))
+	length := int(C.request(&ctx, port, addr.to_wide(), sdata.str, &buff))
 
 	C.vschannel_cleanup(&ctx)
 	return parse_response(string(buff, length))

vlib/http/http_test.v

@@ -1,5 +1,5 @@
 // import net.urllib
-// import http
+import http
 
 fn test_escape_unescape() {
 /*
@@ -12,15 +12,11 @@ fn test_escape_unescape() {
 }
 
 fn test_http_get() {
-/*
-	$if windows { return }
 	assert http.get_text('https://vlang.io/version') == '0.1.5'
 	println('http ok')
-*/
 }
 
-fn test_http_get_from_vlang_utc_now() {
-	/*
+fn test_http_get_from_vlang_utc_now() {	
 	urls := ['http://vlang.io/utc_now', 'https://vlang.io/utc_now']
 	for url in urls {
 		println('Test getting current time from $url by http.get')
@@ -30,11 +26,9 @@ fn test_http_get_from_vlang_utc_now() {
 		assert res.text.int() > 1566403696
 		println('Current time is: ${res.text.int()}')
 	}
-	*/
 }
 
 fn test_public_servers() {
-	/*
 	urls := [
 		'http://github.com/robots.txt',
 		'http://google.com/robots.txt',
@@ -49,5 +43,4 @@ fn test_public_servers() {
 		assert 200 == res.status_code
 		assert res.text.len > 0
 	}
-	*/
 }