libobjc/configure.in needs AC_CONFIG_AUX_DIR() too, patch included

[Jeffrey A Law]

  In message < 199810221844.OAA16122@caip.rutgers.edu >you write:
  > 	Okay, both done.  However libchill wasn't really needed for a
  > bootstrap to succeed.  It never calls AC_CONFIG_AIX_DIR with bogus
  > arguments (indirectly via AC_PROG_INSTALL like the other two libs did.)
Thanks.


  > However, it certainly doesn't hurt to protect ourselves in case libchill
  > decides to locate `install' in the future. 
Agreed. 

jeff