add missing cfns

vlib/os/os.v

@@ -67,7 +67,7 @@ fn C.ftell(fp voidptr) int
 fn C.getenv(byteptr) byteptr
 fn C.sigaction(int, voidptr, int)
 
-fn C.GetLastError() u32
+
 
 // read_bytes reads an amount of bytes from the beginning of the file
 pub fn (f File) read_bytes(size int) []byte {

vlib/os/os_windows.v

@@ -130,7 +130,7 @@ pub fn dir_exists(path string) bool {
 	return false
 }
 
-fn C.CreateDirectory(byteptr, int) bool
+
 
 // mkdir creates a new directory with the specified path.
 pub fn mkdir(path string) ?bool {