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/cmd/symbol_inject.go

@@ -94,4 +94,13 @@ func main() {
 		os.Remove(*output)
 		os.Exit(5)
 	}
+
+	if file.IsMachoFile {
+		err = symbol_inject.CodeSignMachoFile(*output)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err.Error())
+			os.Remove(*output)
+			os.Exit(6)
+		}
+	}
 }