symbol_inject: add step to codesign Mach-O binaries.

The adhoc codesign of Macho-O binaries is broken after symbol
injection. MacOS refuses to run the binaries unless we sign
them again.

Bug: 241493489
Test: build and run simpleperf_ndk64 on MacOS
Change-Id: I25ef5c6413bd97e1bfa0a4ec5d04eaefb6fea54c

symbol_inject/macho.go

@@ -18,6 +18,7 @@ import (
 	"debug/macho"
 	"fmt"
 	"io"
+	"os/exec"
 	"sort"
 	"strings"
 )
@@ -40,7 +41,7 @@ func extractMachoSymbols(machoFile *macho.File) (*File, error) {
 		return symbols[i].Value < symbols[j].Value
 	})
 
-	file := &File{}
+	file := &File{IsMachoFile: true}
 
 	for _, section := range machoFile.Sections {
 		file.Sections = append(file.Sections, &Section{
@@ -95,3 +96,8 @@ func dumpMachoSymbols(r io.ReaderAt) error {
 
 	return nil
 }
+
+func CodeSignMachoFile(path string) error {
+	cmd := exec.Command("/usr/bin/codesign", "--force", "-s", "-", path)
+	return cmd.Run()
+}