Fix error printing for basic directives

core/_preload.odin

@@ -39,6 +39,7 @@ Type_Info_Record :: struct #ordered {
 Type_Info :: union {
 	size:  int,
 	align: int,
+
 	Named{name: string, base: ^Type_Info},
 	Integer{signed: bool},
 	Float{},

core/os_windows.odin

@@ -210,6 +210,10 @@ read_entire_file :: proc(name: string) -> ([]byte, bool) {
 		return nil, false;
 	}
 
+	if length == 0 {
+		return nil, true;
+	}
+
 	data := make([]byte, length);
 	if data == nil {
 		return nil, false;