[Testsuite] treate -specs as both cflags & ldflags Backport from master 2014-11-11 Jiong Wang <jiong.wang@arm.com> ld/testsuite/ * lib/ld-lib.exp (run_ld_link_exec_tests): Append board_cflags if gcc driver used as link tool. (run_cc_link_exec_tests): Likewise.