Make dub executable

[Timoses]

I was surprised to not having to install dub separately as it's already contained in ~/.dvm/compilers/dmd-2.0xx.x/linux/bin/dub
after using

./dvm install dvm
dvm install 2.083.1
dvm use 2.083.1

However, it is not executable which means I had to run

chmod u+x ~/.dvm/compilers/dmd-2.0xx.x/linux/bin/dub

Would be cool if this happened automatically during the installation process.

[jacob-carlborg]

Yes, definitely. The problem is that DVM use Tango, which is not maintained anymore. I need to try to find an old enough compiler that will work.

Ideally DVM should be completely rewritten to not use Phobos instead of Tango but that's a big effort.

[jacob-carlborg]

Fixed in 059c1a8.