Remove "Generating" output from catalog scripts

So by default, they don't output anything if everything is well.

Discussion: https://www.postgresql.org/message-id/867f8a1a-6cf0-d835-78d8-0844e4936241%402ndquadrant.com

Author: petere

src/backend/catalog/genbki.pl

@@ -265,7 +265,6 @@
 
 # Generate postgres.bki, postgres.description, postgres.shdescription,
 # and pg_*_d.h headers.
-print "Generating BKI files and symbol definition headers...\n";
 
 # version marker for .bki file
 print $bki "# PostgreSQL $major_version\n";

src/backend/utils/Gen_fmgrtab.pl

@@ -86,8 +86,6 @@
   Catalog::FindDefinedSymbolFromData($catalog_data{pg_language},
 	'INTERNALlanguageId');
 
-print "Generating fmgrtab.c, fmgroids.h, and fmgrprotos.h...\n";
-
 # Collect certain fields from pg_proc.dat.
 my @fmgr = ();