Don't ship spi_* man pages. (We don't do that anyway, but now it's automatic.)

doc/src/Makefile

 # Postgres documentation makefile
-# $PostgreSQL: pgsql/doc/src/Makefile,v 1.32 2003/11/29 19:51:36 pgsql Exp $
+# $PostgreSQL: pgsql/doc/src/Makefile,v 1.33 2006/12/02 01:25:50 petere Exp $
 
 subdir = doc/src
 top_builddir = ../..
@@ -18,4 +18,5 @@ postgres.tar:
 
 man.tar:
 	$(MAKE) -C sgml man
+	rm sgml/man$(sqlmansect_dummy)/spi_*
 	$(TAR) -cf $@ -C sgml man1 man$(sqlmansect_dummy)