Update tutorial README for required build dependencies.

Forwarded: No, Debian specific

Gbp-Pq: Name 52-tutorial-README.patch

src/tutorial/README

@@ -6,8 +6,7 @@ tutorial
 This directory contains SQL tutorial scripts.  To look at them, first do a
 	% make
 to compile all the scripts and C files for the user-defined functions
-and types.  (make needs to be GNU make --- it may be named something
-different on your system, often 'gmake')
+and types. This requires a postgresql-server-dev-* package to be installed.
 
 Then, run psql with the -s (single-step) flag:
 	% psql -s