* Allow date command to be printed in verbose mode

* Allow date command to be printed in verbose mode
* Get rid of appending -lbz2 and -lz to ExtraLibs now that we don't need
  them any more.
* Fix the dist-check target so that EXTRA_DIST can be defined AFTER the
  include of Makefile.common. This is needed because Makefile.common
  provides variable definitions that may need to be used in computing the
  value of EXTRA_DIST.
* Clean up some "distdir" target output.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18329 91177308-0d34-0410-b5e6-96231b3b80d8