bug#75298: GUD doesn't let me answer debuginfod query

[Daniel Colascione <dancol@dancol.org>]

I'd expect to be able to answer the debuginfod query in the affirmative
in the GUD session below, but nothing I put into the buffer seems
acceptable to GDB.

Current directory is /home/dancol/edev/debug/
GNU gdb (Ubuntu 15.1-1ubuntu2) 15.1
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Reading symbols from /home/dancol/.cache/rr/emacs-5/mmap_clone_5_emacs...
Really redefine built-in command "restart"? (y or n) [answered Y; input not from terminal]
Really redefine built-in command "jump"? (y or n) [answered Y; input not from terminal]
Remote debugging using 127.0.0.1:31571
Reading symbols from /lib64/ld-linux-x86-64.so.2...
Reading symbols from /usr/lib/debug/.build-id/b3/3a9ce38781b940e741fd85448861a71ff2297b.debug...
warning: BFD: warning: system-supplied DSO at 0x6fffd000 has a section extending past end of file

This GDB supports auto-downloading debuginfo from the following URLs:
  <https://debuginfod.ubuntu.com>
Enable debuginfod for this session? (y or [n]) Please answer y or [n].
Enable debuginfod for this session? (y or [n]) Please answer y or [n].
Enable debuginfod for this session? (y or [n]) Please answer y or [n].
Enable debuginfod for this session? (y or [n]) Please answer y or [n].
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