[Svn] [roundcube/roundcubemail] df8834: bin: set error on exit for shell scripts (#7580)

[Filippo Giunchedi]

  Branch: refs/heads/master
  Home:   https://github.com/roundcube/roundcubemail
  Commit: df88349713b469a081ca33d29ecad0291283e99f
      https://github.com/roundcube/roundcubemail/commit/df88349713b469a081ca33d29ecad0291283e99f
  Author: Filippo Giunchedi <filippog at users.noreply.github.com>
  Date:   2020-09-25 (Fri, 25 Sep 2020)

  Changed paths:
    M bin/cssshrink.sh
    M bin/jsshrink.sh
    M bin/makedoc.sh
    M bin/transifexpull.sh

  Log Message:
  -----------
  bin: set error on exit for shell scripts (#7580)

I am building Roundcube via CI jobs, and also ran in #7567 (thank you
for the quick fix!).

The CI job I'm using runs css/js shrink and the build job itself
succeeded, although Roundcube wasn't working.

With this commit all shell scripts will propagate the exit code in case
of errors, e.g. failed downloads.