no macros or symbols from endian.h are being used in this file (#1386)

Author: mehendarkarprajwal

include/xsimd/arch/xsimd_vsx.hpp

@@ -16,8 +16,6 @@
 #include "../types/xsimd_vsx_register.hpp"
 #include "./common/xsimd_common_cast.hpp"
 
-#include <endian.h>
-
 #include <complex>
 #include <type_traits>