Pacify gcc -Wmissing-variable-declarations

This is a new warning diagnostic in GCC 14.
* lib-src/etags.c (mercury_heuristics_ratio):
* src/pgtkselect.c, src/xselect.c (selection_request_stack):
* src/xselect.c (outstanding_transfers):
* src/xterm.c (pending_selection_requests)
(x_dnd_waiting_for_motif_finish_display):
Now static.
* lib-src/make-docfile.c (close_emacs_globals):
Arrange for lispsym to be declared with extern first,
when compiling lread.c.
* src/alloc.c (gdb_make_enums_visible) [__GNUC__]:
* src/emacs.c (RCS_Id):
* src/keyboard.c (stop_character):
* src/print.c (print_output_debug_flag):
Now declared with extern first.
* src/lisp.h (DEFINE_GDB_SYMBOL_BEGIN) [MAIN_PROGRAM]:
Arrange for ID to be declared extern first.
* src/lisp.h (garbage_collection_inhibited):
* src/xterm.h (x_frame_parm_handlers):
Declare here, so that its interface is properly checked.  Other decls
removed.

2 files changed, 6 insertions, 6 deletions

diff --git a/lib-src/etags.c b/lib-src/etags.c
index 84dfa527e98..03bc55de03d 100644
--- a/lib-src/etags.c
+++ b/lib-src/etags.c
@@ -705,7 +705,7 @@ and optionally Prolog-like definitions (first rule for a predicate or \
 function).\n\
 To enable this behavior, run etags using --declarations.";
 static bool with_mercury_definitions = false;
-float mercury_heuristics_ratio = MERCURY_HEURISTICS_RATIO;
+static float mercury_heuristics_ratio = MERCURY_HEURISTICS_RATIO;
 
 static const char *Objc_suffixes [] =
   { "lm",                       /* Objective lex file  */
diff --git a/lib-src/make-docfile.c b/lib-src/make-docfile.c
index ac4f320f9a5..ee589e03397 100644
--- a/lib-src/make-docfile.c
+++ b/lib-src/make-docfile.c
@@ -660,11 +660,11 @@ close_emacs_globals (ptrdiff_t num_symbols)
   printf (("};\n"
            "extern struct emacs_globals globals;\n"
            "\n"
-           "#ifndef DEFINE_SYMBOLS\n"
-           "extern\n"
-           "#endif\n"
-           "struct Lisp_Symbol lispsym[%td];\n"),
-          num_symbols);
+           "extern struct Lisp_Symbol lispsym[%td];\n"
+           "#ifdef DEFINE_SYMBOLS\n"
+           "struct Lisp_Symbol lispsym[%td];\n"
+           "#endif\n"),
+          num_symbols, num_symbols);
 }
 
 static void