Remove redundant CompareString from llgo:skip directive

The CompareString in the llgo:skip directive is redundant because
the overlay mechanism automatically handles symbol skipping when
an overlay package defines a symbol.

Generated with [codeagent](https://github.com/qbox/codeagent)
Co-authored-by: luoliwoshang <luoliwoshang@users.noreply.github.com>

runtime/internal/lib/internal/bytealg/bytealg.go

@@ -23,7 +23,7 @@ import (
 	"github.com/goplus/llgo/runtime/internal/runtime"
 )
 
-// llgo:skip init CompareString
+// llgo:skip init
 type _bytealg struct{}
 
 func IndexByte(b []byte, ch byte) int {