Remove the group section if all members are removed.

Remove the group section if all members are removed.

binutils/

2011-09-15  H.J. Lu  <hongjiu.lu@intel.com>

	PR binutils/13180
	* objcopy.c (is_strip_section_1): New.
	(is_strip_section): Use it.  Remove the group section if all
	members are removed.

binutils/testsuite/

2011-09-15  H.J. Lu  <hongjiu.lu@intel.com>

	PR binutils/13180
	* binutils-all/group-6.d: New.
	* binutils-all/group-6.s: Likewise.

	* binutils-all/objcopy.exp: Run group-6 for ELF targrts.