g++-14 doesn't support C23's _Generic

--- webkitgtk-2.48.1/Source/WTF/wtf/simde/arm/sve.h.orig
+++ webkitgtk-2.48.1/Source/WTF/wtf/simde/arm/sve.h
@@ -7761,7 +7761,7 @@
 #endif
 
 /* TODO: detect compilers which support this outside of C11 mode */
-#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L)
+#if !defined(__cplusplus) && defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L)
   #define SIMDE_CHECKED_REINTERPRET_CAST(to, from, value) _Generic((value), to: (value), default: (_Generic((value), from: ((to) (value)))))
   #define SIMDE_CHECKED_STATIC_CAST(to, from, value) _Generic((value), to: (value), default: (_Generic((value), from: ((to) (value)))))
 #else