- use "gnutar" on Mac OS X to build the binary distribution


Build-tools/Do-compile:
   - merged relevevant changes from 4.0 (Options no-mysqltest, no-benchmark,
     log_timestamp function)
scripts/make_binary_distribution.sh:
   - make sure to use "gnutar" (on Mac OS X) to pack up the binary distribution
     (Mac OS X "tar" seems to be buggy - the resulting tarballs appear to be
     corrupted, e.g. when opening them with Midnight Commander. GNU tar seems
     to extract them correctly, though)