build fails on dev

[normanb]

The build fails on dev (and master) because of

example.cpp:36:10: fatal error: test_multiprocess.h: No such file or directory
 #include "test_multiprocess.h"

Commenting out the include fixes the issue but the file seems redundant as part of the build for most users / devs.

 * THIS FILE IS JUST FOR TESTING WITH SOME LOCAL FILES INCLUDING ABSOLUTE PATHS.
 * IT WILL NOT RUN ON YOUR MACHINE: