[2.23] Fix newer binutils not to assert on non-existence tag_FP_arch

See 1342ca94f07e5164f14acb74b2c3903ba0c4009a

Change-Id: I77b5ce1671fcb6e8b5dca0ddf2269aeaf8f3883d

Author: Andrew Hsieh <andrewhsieh@google.com>
Date:   Sat Apr 6 18:33:39 2013 +0800