BUILD: fd: fix a build warning on the DWCAS

Ilya reported in issue #1816 a build warning on armhf (promoted to error
here since -Werror):

  src/fd.c: In function fd_rm_from_fd_list:
  src/fd.c:209:87: error: passing argument 3 of __ha_cas_dw discards volatile qualifier from pointer target type [-Werror=discarded-array-qualifiers]
    209 |    unlikely(!_HA_ATOMIC_DWCAS(((long *)&fdtab[fd].update), (uint32_t *)&cur_list.u32, &next_list.u32))
        |                                                                                       ^~~~~~~~~~~~~~

This happens only on such an architecture because the DWCAS requires the
pointer not the value, and gcc seems to be needlessly picky about reading
a const from a volatile! This may safely be backported to older versions.

src/fd.c

@@ -206,7 +206,7 @@ lock_self:
 #ifdef HA_CAS_IS_8B
 		 unlikely(!_HA_ATOMIC_CAS(((uint64_t *)&fdtab[fd].update), (uint64_t *)&cur_list.u64, next_list.u64))
 #else
-		 unlikely(!_HA_ATOMIC_DWCAS(((long *)&fdtab[fd].update), (uint32_t *)&cur_list.u32, &next_list.u32))
+		 unlikely(!_HA_ATOMIC_DWCAS(((long *)&fdtab[fd].update), (uint32_t *)&cur_list.u32, (const uint32_t *)&next_list.u32))
 #endif
 	    );
 	next = cur_list.ent.next;