autoconf executes the init commands after each file it creates,
causing these errors at configure time:

  ...
  chmod: cannot access 'tools/intel_aubdump': No such file or directory
  config.status: creating tools/Makefile
  chmod: cannot access 'tools/intel_aubdump': No such file or directory
  config.status: creating tools/intel_aubdump
  config.status: creating tools/quick_dump/Makefile
  ...

Once it creates intel_aubdump, the errors go away. When I first added
the chmod command, I already had a tools/intel_aubdump in my tree and
didn't get the error.

Split the intel_aubdump creation into its own AC_CONFIG_FILES()
invocation to avoid this.

Signed-off-by: Kristian Høgsberg Kristensen <kristian.h.kristensen@intel.com>