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
{
    std::string str, prefix;
    std::string::size_type pos;
    int linenr = 1;
    while (std::getline(stream, str)) {
        bool used_hash = false;
        if ((pos = str.find('#')) != std::string::npos) {
            str = str.substr(0, pos);
            used_hash = true;
        }
        const static std::string pattern = " \t\r\n";
        str = TrimString(str, pattern);
        if (!str.empty()) {
            if (*str.begin() == '[' && *str.rbegin() == ']') {
                const std::string section = str.substr(1, str.size() - 2);
                sections.emplace_back(SectionInfo{section, filepath, linenr});
                prefix = section + '.';
            } else if (*str.begin() == '-') {
                error = strprintf("parse error on line %i: %s, options in configuration file must be specified without leading -", linenr, str);
                return false;
            } else if ((pos = str.find('=')) != std::string::npos) {
                std::string name = prefix + TrimString(std::string_view{str}.substr(0, pos), pattern);
                std::string_view value = TrimStringView(std::string_view{str}.substr(pos + 1), pattern);
                if (used_hash && name.find("rpcpassword") != std::string::npos) {
                    error = strprintf("parse error on line %i, using # in rpcpassword can be ambiguous and should be avoided", linenr);
                    return false;
                }