Clean up support for automake's silent build option.

[Chris Johns]

Hi,

This patch cleans up the build system to support automake's silent build.

With automake-1.12.6 the support is only available using automake
initialisation option while automake-1.16.1 has command line support.

You can view how the output looks here:

 https://ftp.rtems.org/pub/rtems/people/chrisj/erc32-silent-build.txt

Note, this change does not effect the existing build other than
rmeove the silly dump of object files in library wrap up support.

Why do this? It makes it easier to see warnings and issues in a build.

If agreeable a change can be made once we move to automake-1.16.1 to
automatically enable silent builds. There is no hurry to move to 
automake-1.16.1. It can wait until other activities has been
completed.

Chris