Port struct Lisp_FLoat to oddball platforms

* src/lisp.h (struct Lisp_Float): Declare via
GCALIGNED_UNION_MEMBER, not via GCALIGNED_STRUCT, since alloc.c
creates these in arrays and GCALIGNED_STRUCT does not necessarily
suffice to align struct Lisp_Float when it’s used in an array.
This avoids undefined behavior on oddball machines where
sizeof (struct Lisp_Float) is not a multiple of 8 and the compiler
does not support __attribute__ ((aligned 8)).

src/lisp.h

@@ -2801,8 +2801,10 @@ struct Lisp_Float
     {
       double data;
       struct Lisp_Float *chain;
+      GCALIGNED_UNION_MEMBER
     } u;
-  } GCALIGNED_STRUCT;
+  };
+verify (GCALIGNED (struct Lisp_Float));
 
 INLINE bool
 (FLOATP) (Lisp_Object x)