Stop keeping multiple doc copies for items defined multiple times

It was always a nuisance to keep all the copies in sync.
* src/doc.c (Fsnarf_documentation): Don't skip entire files.
Instead, skip individual doc strings starting with "SKIP".
* doc/lispref/internals.texi (Writing Emacs Primitives):
Mention this skipping.
* lisp/term/ns-win.el, lisp/term/pc-win.el, src/dosfns.c:
* src/frame.c, src/nsfns.m, src/nsmenu.m, src/nsterm.m:
* src/w16select.c, src/w32fns.c, src/w32menu.c, src/w32select.c:
* src/w32term.c, src/xmenu.c: Remove duplicated doc strings.
* src/xfns.c: Merge in information from doc string duplicates.

1 files changed, 2 insertions, 34 deletions

diff --git a/src/w16select.c b/src/w16select.c
index ed3d041f2df..2d740a3ee61 100644
--- a/src/w16select.c
+++ b/src/w16select.c
@@ -678,43 +678,11 @@ syms_of_win16select (void)
   defsubr (&Sw16_selection_exists_p);
 
   DEFVAR_LISP ("selection-coding-system", Vselection_coding_system,
-               doc: /* Coding system for communicating with other programs.
-
-For MS-Windows and MS-DOS:
-When sending or receiving text via selection and clipboard, the text
-is encoded or decoded by this coding system.  The default value is
-the current system default encoding on 9x/Me, `utf-16le-dos'
-\(Unicode) on NT/W2K/XP, and `iso-latin-1-dos' on MS-DOS.
-
-For X Windows:
-When sending text via selection and clipboard, if the target
-data-type matches with the type of this coding system, it is used
-for encoding the text.  Otherwise (including the case that this
-variable is nil), a proper coding system is used as below:
-
-data-type       coding system
----------       -------------
-UTF8_STRING     utf-8
-COMPOUND_TEXT   compound-text-with-extensions
-STRING          iso-latin-1
-C_STRING        no-conversion
-
-When receiving text, if this coding system is non-nil, it is used
-for decoding regardless of the data-type.  If this is nil, a
-proper coding system is used according to the data-type as above.
-
-See also the documentation of the variable `x-select-request-type' how
-to control which data-type to request for receiving text.
-
-The default value is nil.  */);
+               doc: /* SKIP: real doc in select.el.  */);
   Vselection_coding_system = intern ("iso-latin-1-dos");
 
   DEFVAR_LISP ("next-selection-coding-system", Vnext_selection_coding_system,
-               doc: /* Coding system for the next communication with other programs.
-Usually, `selection-coding-system' is used for communicating with
-other programs (X Windows clients or MS Windows programs).  But, if this
-variable is set, it is used for the next communication only.
-After the communication, this variable is set to nil.  */);
+               doc: /* SKIP: real doc in select.el.  */);
   Vnext_selection_coding_system = Qnil;
 
   DEFSYM (QCLIPBOARD, "CLIPBOARD");