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
if (args.GetIntArg("-prune", 0)) {
        if (args.GetBoolArg("-txindex", DEFAULT_TXINDEX))
            return InitError(_("Prune mode is incompatible with -txindex."));
        if (args.GetBoolArg("-reindex-chainstate", false)) {
            return InitError(_("Prune mode is incompatible with -reindex-chainstate. Use full -reindex instead."));
        }
    }
    
    if (args.GetBoolArg("-forcednsseed", DEFAULT_FORCEDNSSEED) && !args.GetBoolArg("-dnsseed", DEFAULT_DNSSEED)){
        return InitError(_("Cannot set -forcednsseed to true when setting -dnsseed to false."));
    }
    
    size_t nUserBind = args.GetArgs("-bind").size() + args.GetArgs("-whitebind").size();
    if (nUserBind != 0 && !args.GetBoolArg("-listen", DEFAULT_LISTEN)) {
        return InitError(Untranslated("Cannot set -bind or -whitebind together with -listen=0"));
    }
    
    if (!args.GetBoolArg("-listen", DEFAULT_LISTEN) && args.GetBoolArg("-listenonion", DEFAULT_LISTEN_ONION)) {
        return InitError(Untranslated("Cannot set -listen=0 together with -listenonion=1"));
    }
    
    int nBind = std::max(nUserBind, size_t(1));
    nUserMaxConnections = args.GetIntArg("-maxconnections", DEFAULT_MAX_PEER_CONNECTIONS);
    nMaxConnections = std::max(nUserMaxConnections, 0);
    nFD = RaiseFileDescriptorLimit(nMaxConnections + MIN_CORE_FILEDESCRIPTORS + MAX_ADDNODE_CONNECTIONS + nBind + NUM_FDS_MESSAGE_CAPTURE);
#ifdef USE_POLL
    int fd_max = nFD;
#else
    int fd_max = FD_SETSIZE;
#endif