Add config/compile to config/.gitignore

This file may be added by automake and therefore should be added
to config/.gitignore.  For the full list of possible auxiliary
programs see the full automake documentation.

http://www.gnu.org/software/automake/manual/automake.html#Auxiliary-Programs

Signed-off-by: Marcel Wysocki <maci.stgn@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2848