Don't document removed SITELOAD_PURESIZE_EXTRA

* doc/lispref/internals.texi (Building Emacs): Don't document removed
constant SITELOAD_PURESIZE_EXTRA.

(cherry picked from commit d05ee2ba80b0961015eb543536266208afb57dff)

diff --git a/doc/lispref/internals.texi b/doc/lispref/internals.texi
index be987e1f977e51f9a5fea396a0a821037ac49722..dc55b63c5dae87f81db3d85e704b57b99cb319b2 100644 (file)
--- a/doc/lispref/internals.texi
+++ b/doc/lispref/internals.texi
@@ -102,19 +102,9 @@ Emacs.
 
 @cindex @file{site-load.el}
   You can specify additional files to preload by writing a library named
-@file{site-load.el} that loads them.  You may need to rebuild Emacs
-with an added definition
-
-@example
-#define SITELOAD_PURESIZE_EXTRA @var{n}
-@end example
-
-@noindent
-to make @var{n} added bytes of pure space to hold the additional files;
-see @file{src/puresize.h}.
-(Try adding increments of 20000 until it is big enough.)  However, the
-advantage of preloading additional files decreases as machines get
-faster.  On modern machines, it is usually not advisable.
+@file{site-load.el} that loads them.  However, the advantage of
+preloading additional files decreases as machines get faster.  On modern
+machines, it is usually not advisable.
 
   After @file{loadup.el} reads @file{site-load.el}, it finds the
 documentation strings for primitive and preloaded functions (and