[Bug external/31520] [gdb/external] Handle kernel.yama.ptrace_scope != 0

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

https://sourceware.org/bugzilla/show_bug.cgi?id=31520

--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #2)
> 3. An attach-specific failure:
> ...
> (gdb) attach 27466^M
> Attaching to process 27466^M
> No executable file now.^M
> warning: Could not load vsyscall page because no executable was specified^M
> 0x00007f18b597f0ca in ?? ()^M
> (gdb) FAIL: gdb.base/attach-deleted-exec.exp: attach to process with deleted
> executable
> ...

While with ptrace_scope == 0, we get:
...
(gdb) attach 23176^M
Attaching to process 23176^M
Reading symbols from /proc/23176/exe...^M
Reading symbols from /lib64/libm.so.6...^M
(No debugging symbols found in /lib64/libm.so.6)^M
Reading symbols from /lib64/libc.so.6...^M
(No debugging symbols found in /lib64/libc.so.6)^M
Reading symbols from /lib64/ld-linux-x86-64.so.2...^M
(No debugging symbols found in /lib64/ld-linux-x86-64.so.2)^M
0x00007f18f32620ca in clock_nanosleep@GLIBC_2.2.5 () from /lib64/libc.so.6^M
(gdb) PASS: gdb.base/attach-deleted-exec.exp: attach to process with deleted
executable
...

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