cl: clean test

compiler/cl/_testrt/hello/in.go

@@ -1,6 +1,6 @@
 package main
 
-import "github.com/goplus/llgo/compiler/cl/internal/libc"
+import "github.com/goplus/llgo/compiler/cl/_testrt/hello/libc"
 
 var format = [...]int8{'H', 'e', 'l', 'l', 'o', ' ', '%', 'd', '\n', 0}
 

compiler/cl/_testrt/hello/libc/libc.go

@@ -0,0 +1,14 @@
+package libc
+
+import "C"
+import _ "unsafe"
+
+const (
+	LLGoPackage = "decl"
+)
+
+//go:linkname Printf C.printf
+func Printf(format *int8, __llgo_va_list ...any)
+
+//go:linkname Strlen C.strlen
+func Strlen(str *int8) C.int