[Users] Building libetpan for Claws Mail

[Michael Schwendt]

Another question for Claws Mail power-users:

I've just discovered that libetpan doesn't look for libcurl and libexpat
anymore, because a commit from 2012 accidentally disables the automatic
check for those two libs:

  https://github.com/dinhviethoa/libetpan/issues/221

Even if you build --with-curl=yes or --with-expat=yes that won't work.
The commit got it backwards, and only --with-curl=no --with-expat=no
would trigger the other cases of the if-else block.

How have you built libetpan so far?