perf/core improvements and fixes:

New features:

- Generate comm, fork and exit events when converting perf.data files to CTF (Wang Nan)

Infrastructure:

- Add libbabeltrace to build-test (Wang Nan)

- 'perf record' prep work to support multiple evlists (Wang Nan)

- Remove unused hist_entry__annotate function (Ravi Bangoria)

- Add more toolchain triplets (Ravi Bangoria)

- Update message for slang devel packages on Ubuntu (Neeraj Badlani)

- Generalize handling of 'ret' instructions in the annotate TUI (Naveen N. Rao)

- Use proper dso name for is_regular_file, fixing device file handling (Jiri Olsa)

Build Fixes:

- Add missing config.h include, fixing the build with libbabeltrace (Jiri Olsa)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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