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 <nodemempool_args.h>
#include <nodemempool_persist_args.h>
#include <nodeminer.h>
#include <nodetxreconciliation.h>
#include <nodevalidation_cache_args.h>
#include <policyfeerate.h>
#include <policyfees.h>
#include <policyfees_args.h>
#include <policypolicy.h>
#include <policysettings.h>
#include <protocol.h>
#include <rpcblockchain.h>
#include <rpcregister.h>
#include <rpcserver.h>
#include <rpcutil.h>
#include <scheduler.h>
#include <scriptsigcache.h>
#include <scriptstandard.h>
#include <shutdown.h>
#include <sync.h>
#include <timedata.h>
#include <torcontrol.h>
#include <txdb.h>
#include <txmempool.h>
#include <utilasmap.h>
#include <utilcheck.h>
#include <utilmoneystr.h>
#include <utilstrencodings.h>
#include <utilstring.h>
#include <utilsyscall_sandbox.h>