Added a "-j 4" to the "make" in create_tarball.sh so that it will

take a little less time.  This seemed to save about 5 minutes per
branch tarball.

This commit was SVN r12401.

contrib/nightly/create_tarball.sh

@@ -285,7 +285,7 @@ do_command "./configure --enable-dist"
 # that this may need to change in the future...
 save=$LD_LIBRARY_PATH
 LD_LIBRARY_PATH=
-do_command "make distcheck"
+do_command "make -j 4 distcheck"
 LD_LIBRARY_PATH=$save
 save=