[binutils-gdb] Remove unstable test output

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 49af4b7012b682470bba3d66262bd34f48b9f500 ***

Author: Richard Bunt <richard.bunt@arm.com>
Branch: master
Commit: 49af4b7012b682470bba3d66262bd34f48b9f500

Remove unstable test output

Changed test output from:
PASS: gdb.base/watchpoint-hw-attach.exp: attach 25501
to
PASS: gdb.base/watchpoint-hw-attach.exp: attach

gdb/testsuite/ChangeLog:

	* gdb.base/watchpoint-hw-attach.exp: Remove unstable output.