Amend README so that it makes reasonable sense no matter whether

you've got your source code from a tarball (with makefiles) or from
svn (without makefiles). While I'm here, mention Makefile.wce.

[originally from svn r7352]

README

@@ -2,7 +2,13 @@ This is the README accompanying the source code to Simon Tatham's
 puzzle collection. The collection's web site is at
 <http://www.chiark.greenend.org.uk/~sgtatham/puzzles/>.
 
-You should find several Makefiles in the source code:
+If you've obtained the source code by downloading a .tar.gz archive
+from the Puzzles web site, you should find several Makefiles in the
+source code. However, if you've checked the source code out from the
+Puzzles Subversion repository, you won't find the Makefiles: they're
+automatically generated by `mkfiles.pl', so run that to create them.
+
+The Makefiles include:
 
  - `Makefile' should work under GNU make on Linux, provided you have
    GTK installed to compile and link against. It builds GTK binaries
@@ -19,6 +25,9 @@ You should find several Makefiles in the source code:
    application capable of running any of the puzzles, or even more
    than one of them at a time.
 
+ - `Makefile.wce' should work under MS eMbedded Visual C++ on
+   Windows and the Pocket PC SDK; it builds Pocket PC binaries.
+
 Many of these Makefiles build a program called `nullgame' in
 addition to the actual game binaries. This program doesn't do
 anything; it's just a template for people to start from when adding
@@ -30,9 +39,9 @@ ignore it.
 
 DO NOT EDIT THE MAKEFILES DIRECTLY, if you plan to send any changes
 back to the maintainer. The makefiles are generated automatically by
-the Perl script `mkfiles.pl' from the file `Recipe'. If you need to
-change the makefiles as part of a patch, you should change Recipe
-and/or mkfiles.pl.
+the Perl script `mkfiles.pl' from the file `Recipe' and the various
+.R files. If you need to change the makefiles as part of a patch,
+you should change Recipe, *.R, and/or mkfiles.pl.
 
 The manual is provided in Windows Help format for the Windows build;
 in text format for anyone who needs it; and in HTML for the Mac OS X