mk: disable warning for packed member pointer
mk: disable warning for packed member pointer

gcc 9 on Fedora 30 gives an error
"taking address of packed member may result in an
unaligned pointer value" warnings.

For clang builds this warning is already disabled,
so disable "-Waddress-of-packed-member" for gcc builds
also.

Snippet of build error:
lib/librte_eal/linux/eal/eal_memalloc.c: In function ‘alloc_seg_walk’:
lib/librte_eal/linux/eal/eal_memalloc.c:768:12: error:
taking address of packed member of ‘struct rte_mem_config’ may result
in an unaligned pointer value [-Werror=address-of-packed-member]
  768 |  cur_msl = &mcfg->memsegs[msl_idx];
      |            ^~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Reshma Pattan <4d9eb35579760ed1c2db754a6b402039c9c8a1cb@intel.com>
Tested-by: David Marchand <f28529695cfa9e3e1eb84e7072aa626af4abb18e@redhat.com>

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