Running bde_verify prompts "Modification of a read-only value attempted at ... line 462"

**Describe the bug**
After build and install bde_verify, I am trying to use the bde_verify on one component. But it prompts error:
```
$ /path/to/bde_verify/bde_verify xxx.cpp
Modification of a read-only value attempted at /path/to/bde_verify/Linux-c++/bin/bde_verify line 462.
```

**Environment:**
- Operating System and Version: Ubuntu 20.04
- Perl: v5.30.0

Reproduce the command shown with the installed bde_verify on Ubuntu 20.04 and Perl 5.30. Inspect the installed Linux-c++/bin/bde_verify script around line 462 to identify the read-only value modification, then verify that bde_verify completes successfully on the sample C++ component.

Written by the indexing model from the issue text.