[PATCH] fix compile error with clang

[Dave Murphy]

Cross compiling for macOS using osxcross gives errors of the form
"error: default initialization of an object of ... without a
user-provided default constructor"

Fixed by attached patch, tested compile with mingw-w64, osxcross and
linux native builds.

2018-12-20  Dave Murphy  <davem@devkitpro.org>

    * gdb/dtrace-probe.c (dtrace_static_probe_ops): explicit zero initialise.
    * gdb/probe.c (any_static_probe_ops): ditto
    * gdb/record-btrace.c (record_btrace_thread_observer_token): ditto
    * gdb/stap-probe.c (stap_static_probe_ops): ditto
    * gdb/tui/tui-hooks.c (tui_observers_token): ditto
    * gdb/unittests/observable-selftests.c (token1, token2, token3): ditto
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