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
#include <init.h>
#include <interfaces/chain.h>
#include <interfaces/init.h>
#include <interfaces/wallet.h>
#include <net.h>
#include <node/context.h>
#include <node/interface_ui.h>
#include <outputtype.h>
#include <univalue.h>
#include <util/check.h>
#include <util/moneystr.h>
#include <util/system.h>
#include <util/translation.h>
#ifdef USE_BDB
#include <wallet/bdb.h>
#endif
#include <wallet/coincontrol.h>
#include <wallet/wallet.h>
#include <walletinitinterface.h>
using node::NodeContext;
namespace wallet {
class WalletInit : public WalletInitInterface
{
public:
    
    bool HasWalletSupport() const override {return true;}