- reverted change from AC_CONFIG_HEADERS to AM_CONFIG_HEADER in configure.in

   again - even though the automake docs consider AM_CONFIG_HEADER obsolete, 
   it currently still breaks for too many people to justify this change
   at the moment.

configure.in

@@ -5,7 +5,7 @@ AC_INIT(sql/mysqld.cc)
 AC_CANONICAL_SYSTEM
 # The Docs Makefile.am parses this line!
 AM_INIT_AUTOMAKE(mysql, 4.0.14)
-AC_CONFIG_HEADERS(config.h)
+AM_CONFIG_HEADER(config.h)
 
 PROTOCOL_VERSION=10
 DOT_FRM_VERSION=6