texstudio package: debug build instead of release provided

[Tim Hoffmann]

Dear package maintainer,

it's nice to see that TeXstudio is included in the repository by now. 
However, I noticed that you provide a debug build instead of a release 
build. It would be good to correct this. The build script BUILD.sh has 
been extended to ask for the required build configuration. So, 
generating a release build is quite easy.

Thank you for your work,
Tim