Remove obsolete debugging option, RTDEBUG.

The r-tree AM that used it was removed back in 2005.

Peter Geoghegan

Author: hlinnaka

src/include/pg_config_manual.h

@@ -321,7 +321,6 @@
  */
 /* #define HEAPDEBUGALL */
 /* #define ACLDEBUG */
-/* #define RTDEBUG */
 
 /*
  * Automatic configuration file name for ALTER SYSTEM.