https://bugs.gentoo.org/943213
https://bugs.webkit.org/show_bug.cgi?id=282120
https://github.com/WebKit/WebKit/commit/63f7badbada070ebaadd318b2801818ecf7e7ea0
https://github.com/WebKit/WebKit/pull/35743
https://unicode-org.atlassian.net/jira/software/c/projects/ICU/issues/ICU-22954

From 63f7badbada070ebaadd318b2801818ecf7e7ea0 Mon Sep 17 00:00:00 2001
From: Don Olmstead <don.olmstead@sony.com>
Date: Sat, 26 Oct 2024 08:27:01 -0700
Subject: [PATCH] Support ICU 76.1 build
 https://bugs.webkit.org/show_bug.cgi?id=282120

Reviewed by Yusuke Suzuki.

In ICU 76.1 an additional macro `U_SHOW_CPLUSPLUS_HEADER_API` was added to
control visibility of the C++ API within ICU. Set this value to `0` since WebKit
wants to only use the C API.

* Source/WTF/wtf/Platform.h:

Canonical link: https://commits.webkit.org/285727@main
--- a/Source/WTF/wtf/Platform.h
+++ b/Source/WTF/wtf/Platform.h
@@ -115,6 +115,7 @@
 /* ICU configuration. Some of these match ICU defaults on some platforms, but we would like them consistently set everywhere we build WebKit. */
 #define U_HIDE_DEPRECATED_API 1
 #define U_SHOW_CPLUSPLUS_API 0
+#define U_SHOW_CPLUSPLUS_HEADER_API 0
 #ifdef __cplusplus
 #define UCHAR_TYPE char16_t
 #endif