compiler: make main function normally to compatible multiple main functions in testing mode

compiler/cl/cltest/cltest.go

@@ -152,10 +152,6 @@ func TestCompileEx(t *testing.T, src any, fname, expected string, dbg bool) {
 		t.Fatal("cl.NewPackage failed:", err)
 	}
 
-	if prog.NeedPyInit { // call PyInit if needed
-		ret.PyInit()
-	}
-
 	if v := ret.String(); v != expected && expected != ";" { // expected == ";" means skipping out.ll
 		t.Fatalf("\n==> got:\n%s\n==> expected:\n%s\n", v, expected)
 	}