__builtin_shufflevector seems to be never enabled

[lu1and10]

It seems that:

xsimd/include/xsimd/arch/generic/xsimd_generic_memory.hpp

Lines 489 to 493 in 182a460

	#if defined(__has_builtin)
	#if __has_builtin(__builtin_shuffle_vector)
	#define builtin_shuffle __builtin_shuffle_vector
	#endif
	#endif

should be:

#if defined(__has_builtin)
#if __has_builtin(__builtin_shufflevector)
#define builtin_shuffle __builtin_shufflevector
#endif
#endif

See references:
https://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html
and
https://clang.llvm.org/docs/LanguageExtensions.html#langext-builtin-shufflevector