compiler: module init function & init consts for cached modules

vlib/builtin/builtin.v

@@ -4,7 +4,7 @@
 
 module builtin
 
-fn builtin_init() int {
+fn init() {
 	$if windows {	
 		if is_atty(0) {
 			C._setmode(C._fileno(C.stdin), C._O_U16TEXT)
@@ -15,13 +15,8 @@ fn builtin_init() int {
 		C.SetConsoleMode(C.GetStdHandle(C.STD_OUTPUT_HANDLE), C.ENABLE_PROCESSED_OUTPUT | 0x0004) // ENABLE_VIRTUAL_TERMINAL_PROCESSING
 		C.setbuf(C.stdout,0)
 	}
-	return 1
 }
 
-const (
-	_ = builtin_init()
-)
-
 fn C.memcpy(byteptr, byteptr, int)
 fn C.memmove(byteptr, byteptr, int)
 //fn C.malloc(int) byteptr

vlib/http/http.v

@@ -9,7 +9,6 @@ import http.chunked
 
 const (
 	max_redirects = 4
-	_ = http.init()
 )
 
 struct Request {

vlib/net/net.v

@@ -1,9 +1,5 @@
 module net
 
-const (
-	_ = net.init()
-)
-
 // hostname returns the host name reported by the kernel. 
 pub fn hostname() ?string {
   	mut name := [256]byte