The `make install` script, which most users would run via `sudo` to install into `/usr/local`, will use the current umask of the root user when creating certain files and directories. If one uses a restrictive umask by default (e.g. `umask 077`), this means that only the root user will be able to use the full Bitcoin package.

**Expected behavior**

The install script creates all directories and files, including man pages, etc., with permissions `644` / `755`.

**Actual behavior**

Certain folders are created using the default umask, e.g.:

- /usr/local/share/man/man1/
- /usr/local/lib/pkgconfig/
- [...]

This means that only root can access files in these folders and other users won't be able to read the man pages (for example).

**To reproduce**

```bash
$ ./autogen.sh
$ make
$ sudo -iu root
% umask 077
% make install
```

**System information**

OS: Linux
bitcoind version: HEAD
unsigned int flags, std::string& error)
{
    
    if (key.negated) {
        if (flags & ArgsManager::DISALLOW_NEGATION) {
            error = strprintf("Negating of -%s is meaningless and therefore forbidden", key.name);
            return std::nullopt;
        }
        
        if (value && !InterpretBool(*value)) {
            LogPrintf("Warning: parsed potentially confusing double-negative -%s=%s\n", key.name, *value);
            return true;
        }
        return false;
    }
    if (!value && (flags & ArgsManager::DISALLOW_ELISION)) {
        error = strprintf("Can not set -%s with no value. Please specify value with -%s=value.", key.name, key.name);
        return std::nullopt;
    }
    return value ? *value : "";
}
ArgsManager::ArgsManager() = default;
ArgsManager::~ArgsManager() = default;