ARM architecture as a case statement

[pekovac]

On different systems _isarm=$(echo $_cputype|awk '{print substr($0,0,4)}') provides a different results, on RPi it's working with expected results, but on Odroid-XU4 the output is armv which is not matched in current version of the script, thus resulting in error:

Debian 8 Odroid-XU4

# uname -a
Linux nas 4.9.61-odroidxu4 #2 SMP PREEMPT Wed Nov 22 16:34:23 CET 2017 armv7l GNU/Linux
# curl -sSf https://moncho.github.io/dry/dryup.sh | sudo sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    10  100    10    0     0     33      0 --:--:-- --:--:-- --:--:--    33
armv
sh: 233: CFG_CPUTYPE: parameter not set

Raspberry Pi

# uname -a
Linux retropie 4.9.26v7-aufs #1 SMP Tue May 9 20:14:03 CEST 2017 armv7l GNU/Linux
# curl -sSf https://moncho.github.io/dry/dryup.sh | sudo sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    10  100    10    0     0     38      0 --:--:-- --:--:-- --:--:--    38
dryup: downloading dry binary
######################################################################## 100.0%
dryup: Moving dry binary to its destination
dryup: dry binary was copied to /usr/local/bin, now you should 'sudo chmod 755 /usr/local/bin/dry'

[moncho]

Thanks for the PR!!!

Would you mind fixing the indentation of the new case statement? Other than that, the change LGTM.

[pekovac]

@moncho indentation fixed as requested.