build: separate compiler and libs

compiler/cl/_testdata/uint/in.go

@@ -0,0 +1,13 @@
+package main
+
+import "github.com/goplus/llgo/c"
+
+func f(a c.Uint) c.Uint {
+	a++
+	return a
+}
+
+func main() {
+	var a c.Uint = 100
+	c.Printf(c.Str("Hello, %u\n"), f(a))
+}