Log Message:
Updating package for Log4CPlus in devel/log4cplus from 2.0.2 to 2.0.3

Because of the fixed new API changes, bump the API version in buildlink3.mk
to 2.0.3 - since 1.x API will likely disappear (it's already deprecated)

# log4cplus 2.0.3

  - Fix compilation on systems without `O_CLOEXEC`. This affects, e.g.,
    Solaris 10. GitHub issue #326. (Patch by Jiangrz).

  - Provide `log4cplus::deinitialize()` to make the API symmetric
    (`log4cplus::initialize()` already exists) and to allow
    de-/initialization without `log4cplus::Initializer` instance. GitHub
    issue #340.

  - Deal with `register` keyword being generated in SWIG based bindings. The
    keyword is unused and reserved in C++17. Remove use of
    `std::unary_function`, it was removed in C++17.

  - Add ability to define new log levels using C API. Add reconfiguration
    API. (Jens Rehsack)

  - Add `NDCMatchFilter` and `MDCMatchFilter`. (Franck)