Makefile.am: Be quieter during 'make dist'
Makefile.am: Be quieter during 'make dist'

In order to use 'make dist' in tools/make-source (See #4178)
the 'make --silent dist' target should run quietly.

Closes #4208
Reviewed-by: Dominik Perpeet <f7830b2723a5db4fc185058b06cfab4b89a38da9@redhat.com>

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