Changed handling of predefined macros in cc65 allows for simplification.
Merge pull request #444 from oliverschmidt/master

Changed handling of predefined macros in cc65 allows for simplification.
Reduce travis overhead for testing 6502 ports.

- build cc65 libraries only for target supported by Contiki
- instead of building all examples for all 6502 targets build
  - all examples for one target (c64)
  - the most demanding client example (webbrowser) for all 6502 targets
  - the most demanding server examples (webserver) for all 6502 targets
Merge pull request #445 from oliverschmidt/master

Reduce travis overhead for testing 6502 ports.
Show current IP config on startup.
Merge pull request #446 from oliverschmidt/master

Show current IP config on startup.
Merge remote-tracking branch 'upstream/master' into push/travis-fix
Revert "Merge pull request #445 from oliverschmidt/master"

This reverts commit 0ac3e0f9246ae1fb4ed79de861c8c9fe73d2b653, reversing
changes made to e5a0f2d663f4d218cd0399e8cbba4d9f6fd1e90c.