[libcamera-devel] Optional dependency seems to be required

[Sebastian Fricke]

Hello everyone,

during the installation process of libcamera, I followed the
instructions on: http://libcamera.org/getting-started.html .
I noticed, I was required to install the boost library `libboost-dev`,
while the instruction flags it as optional.

My system is:
```
basti at basti:~$ uname -a
Linux basti 5.8.0-rc6 #1 SMP Wed Jul 22 10:22:11 CEST 2020 x86_64 GNU/Linux
```

and I am running on this distro:

```
basti at basti:~$ lsb_release -d
Description:    Debian GNU/Linux 10 (buster)
```

Does anyone else encounter this problem? Was a setting incorrect on my
side? Should I open a patch for it?

Thanks in advance.
(And thanks for the cool project)

Greetings,
Sebastian