package/log4cxx: bump to version 0.12.0

- Drop patch (already in version)
- Switch to cmake-package

https://www.mail-archive.com/announce@apache.org/msg06525.html



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>