[Bug build/28312] maintenance_show_worker_threads lacks CXX_STD_THREAD guard

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28312

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|gdb                         |build
         Resolution|---                         |FIXED
   Target Milestone|---                         |12.1
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |vries at gcc dot gnu.org

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=42f46152849a2d4bd06a87c2dc795de1f7fc1af7
:

[gdb/build] Fix build with undefined CXX_STD_THREAD

When building gdb on openSUSE Leap 42.3, we trigger the case that
CXX_STD_THREAD is undefined, and run into:
...
gdb/maint.c: In function 'void maintenance_show_worker_threads \
  (ui_file*, int, cmd_list_element*, const char*)':
gdb/maint.c:877:14: error: 'gdb::thread_pool' has not been declared
         gdb::thread_pool::g_thread_pool->thread_count ());
              ^
Makefile:1647: recipe for target 'maint.o' failed
make[1]: *** [maint.o] Error 1
...

Fix this by handling the undefined CXX_STD_THREAD case in
maintenance_show_worker_threads, such that we get:
...
$ gdb -q -batch -ex "maint show worker-thread"
The number of worker threads GDB can use is 0.
...

Tested on x86_64-linux.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28312

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