nodejs-dev and php7.2-dev have conflicting requirements in Bionic

[Robin Munn]

Because of https://bugs.launchpad.net/debian/+source/nodejs/+bug/1779863, the nodejs-dev package now depends on libssl1.0-dev. The php7.2-dev package depends on libssl-dev, but libssl1.0-dev conflicts with libssl-dev. This makes it impossible to have nodejs-dev (or anything that depends on it, such as npm) and php7.2-dev installed at the same time, which is something that web developers might want to do pretty often (for example, I just ran into this issue while trying to set up a new laptop, running Bionic, for web development).

To reproduce: `sudo apt install npm php7.2-dev`

Package versions I observed this in:

npm 3.5.2-0ubuntu4, which depends on
node-gyp 3.6.2-1ubuntu1, which depends on
nodejs-dev 8.10.0~dfsg-2ubuntu0.4, whose LibSSL dependency conflicts with
php7.2-dev 7.2.17-0ubuntu0.18.04.1

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Julian Groß (juliangro)]

Obviously this also keeps people from using libssl-dev and nodejs-dev (or npm) together.
QT 5.15 depends on the OpenSSL version in libssl-dev which makes it hard to use Bionic to build AppImages for applications using QT 5.15.