Fails to run on Raspberry Pi 3 Model B
On the latest Raspbian Stretch with Desktop:
```
pi@raspberrypi:~/github/openmonero $ mysql --version
mysql  Ver 15.1 Distrib 10.1.23-MariaDB, for debian-linux-gnueabihf (armv7l) using readline 5.2
pi@raspberrypi:~/github/openmonero $ sudo mysql -u root -p < sql/openmonero.sql 
Enter password: 
pi@raspberrypi:~/github/openmonero $ sudo build/openmonero
Blockchain path: /home/pi/.bitmonero/lmdb
Check block height: 140059 no of mempool txs: 0
terminate called after throwing an instance of 'mysqlpp::ConnectionFailed'
terminate called recursively
Aborted
```
I'm fairly certain that I got the config file (root password etc) right. Can it be that the specific MySQL version available on Raspbian has some problems?

FWIW, the daemon is still far from being fully synced:
```
status
Height: 140160/1452780 (9.6%) on mainnet, not mining, net hash 19.58 MH/s, v1, up to date, 9(out)+0(in) connections, uptime 0d 1h 57m 10s
```
Could this have anything to do with the crash?