Changeset b6529a3 in rtems

Patch from Ralf Corsepius <corsepiu@…> to reorganize
the build-tools layout to simplify it.

This script reorganizes and simpilfies the build-tools subdirectories.
It moves all source-files and scripts to c/build-tools/. This will
enable use to use this directory directly to refer to the build-tools
instead of copying them around in a "preinstall" step in future.
However, RTEMS's autoconf Makefile.ins and *.cfg files are not yet
prepared to apply this approach and therefore require additional work.