RTEMS Net Legacy does not build as a package in the RSB

The waf support does not handle staged builds or the options --rtems-tools and --rtems at the same time. The build fails when reading the rtemsbsp static library because it will not be in the PREFIX.

Also the build script scans for .c and .h files. This is fragile. If someone copies in a C file for some reason it is picked up. The sources and headers need to be explicit in build script.

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