compiler: detect and error on public init function & remove empty init functions

compiler/fn.v

@@ -222,6 +222,10 @@ fn (p mut Parser) fn_decl() {
 		f.name = p.check_name()
 	}
 	f.fn_name_token_idx = p.cur_tok_index()
+	// init fn
+	if f.name == 'init' && f.is_public {
+		p.error('init function cannot be public')
+	}
 	// C function header def? (fn C.NSMakeRect(int,int,int,int))
 	is_c := f.name == 'C' && p.tok == .dot
 	// Just fn signature? only builtin.v + default build mode

vlib/http/backend_win.v

@@ -4,18 +4,13 @@
 
 module http
 
-
 #flag windows -I @VROOT/thirdparty/vschannel
-#flag -l ws2_32
+#flag -l ws2_32, crypt32, secur32
-#flag -l crypt32
-#flag -l secur32
  
 #include "vschannel.c"
 
 fn C.new_tls_context() C.TlsContext
 
-fn init() int { return 1 }
-
 fn (req &Request) ssl_do(port int, method, host_name, path string) ?Response {
 	mut ctx := C.new_tls_context()
 	C.vschannel_init(&ctx)

vlib/net/init_nix.v

@@ -6,8 +6,6 @@ module net
 #include <netdb.h>
 #include <errno.h>
 
-fn init() int { return 1 }
-
 fn error_code() int {
     return C.errno
 }

vlib/net/init_win.v

@@ -20,13 +20,12 @@ const (
 	WSA_V22 = 0x202 // C.MAKEWORD(2, 2)
 )
 
-fn init() int {
+fn init() {
 	mut wsadata := C.WSAData{}
 	res := C.WSAStartup(WSA_V22, &wsadata)
 	if res != 0 {
 		panic('socket: WSAStartup failed')
 	}
-	return 1
 }
 
 fn error_code() int {