core: include <type_traits> anyway

Author: jcarpent

include/proxsuite/linalg/veg/type_traits/constructible.hpp

@@ -5,16 +5,7 @@
 #include "proxsuite/linalg/veg/internal/prologue.hpp"
 
 #include <new>
-
-#if !VEG_HAS_BUILTIN(__has_trivial_destructor) ||                              \
-  !VEG_HAS_BUILTIN(__is_trivially_constructible) ||                            \
-  !VEG_HAS_BUILTIN(__is_constructible) ||                                      \
-  !VEG_HAS_BUILTIN(__is_nothrow_constructible) ||                              \
-  !VEG_HAS_BUILTIN(__is_trivially_copyable) ||                                 \
-  !VEG_HAS_BUILTIN(__is_trivial) || !VEG_HAS_BUILTIN(__is_final) ||            \
-  !VEG_HAS_BUILTIN(__is_empty)
 #include <type_traits>
-#endif
 
 namespace proxsuite {
 namespace linalg {