refactor(llcppsigfetch):reuse llgo/preprocessor

[luoliwoshang]

• panic: todo: syscall.forkAndExecInChild1 - dir

package main

import (
	"os/exec"
	"path/filepath"
)

func main() {
	cmd := exec.Command("ls", "-l")
	cmd.Dir = filepath.Dir("./")
	cmd.Run()
}

goplus/llgo#1140

[qiniu-x]

[Git-flow] Hi @luoliwoshang, There are some suggestions for your information:

---

Rebase suggestions

• Following commits have duplicated messages

  test with abs path

  test with abs path

Which seems insignificant, recommend to use git rebase command to reorganize your PR.

For other git-flow instructions, recommend refer to these examples.

Details

If you have any questions about this comment, feel free to raise an issue here:

• https://github.com/qiniu/reviewbot