Trying to fix "Failed to run built executable using after_script when executable path contains spaces" issue.

According to Travis CI Support:
> You may have to double-quote the command you're running there, so it
looks like:
> '"./Build solutions/Traditional batch commands/Built software/Hello C
world!.exe"'

Let's try it out.

Signed-off-by: Ｖ字龍(Vdragon) <Vdragon.Taiwan@gmail.com>