bug#70942: 30.0.50; More build warnings

[Jacob Faibussowitsch <jacob.fai@gmail.com>]

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Hello,

Follow-on from bug #63415, some more build warnings for latest trunk (8074c08cd553ab6ee5ffe61cc2e56fb1e0a4fe34) I have collected over the last few weeks:

C/C++ warnings:
————————————————————————————
dispnew.c:3682:12: warning: variable 'changed_p' set but not used [-Wunused-but-set-variable]
      bool changed_p = 0, mouse_face_overwritten_p = 0;
           ^
1 warning generated.

xdisp.c:35742:1: warning: unused function 'note_fringe_highlight' [-Wunused-function]
note_fringe_highlight (struct frame *f, Lisp_Object window, int x, int y,
^
1 warning generated.

keyboard.c:5403:19: warning: no previous extern declaration for non-static variable 'lispy_function_keys' [-Wmissing-variable-declarations]
const char *const lispy_function_keys[] =
                  ^
keyboard.c:5403:7: note: declare 'static' if the variable is not intended to be used outside of this translation unit
const char *const lispy_function_keys[] =
      ^
1 warning generated.
————————————————————————————

Elisp warnings:
————————————————————————————
In end of data:
image/image-dired-util.el:208:14: Warning: the function ‘clear-image-cache’ is not known to be defined.

In end of data:
net/eww.el:1365:59: Warning: the function ‘imagep’ is not known to be defined.

org.texi:15658: warning: @anchor should not appear on @item line
org.texi:15671: warning: @anchor should not appear on @item line
————————————————————————————

Best Regards,

Jacob Faibussowitsch
(Jacob Fai - booss - oh - vitch)

—

In GNU Emacs 30.0.50 (build 1, aarch64-apple-darwin23.4.0) of 2024-05-14
 built on jfaibussowit-mlt
Repository revision: 8074c08cd553ab6ee5ffe61cc2e56fb1e0a4fe34
Repository branch: master
System Description:  macOS 14.4.1

Configured using:
 'configure --prefix=/Users/jfaibussowit/soft/packages CC=clang
 CXX=clang++ 'CFLAGS=-O3 -mtune=native -flto=thin -std=gnu17
 -Wno-unused-command-line-argument -Wno-unknown-pragmas' 'CXXFLAGS=-O3
 -mtune=native -flto=thin -std=gnu++20 -Wno-unused-command-line-argument
 -Wno-unknown-pragmas' LDFLAGS=-L/opt/homebrew/lib -C --without-x
 --without-ns --without-compress-install --with-native-compilation
 --with-json --with-tree-sitter'

Configured features:
ACL GMP GNUTLS LIBXML2 MODULES NATIVE_COMP NOTIFY KQUEUE PDUMPER SQLITE3
THREADS TREE_SITTER ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

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