When building reproducible build for Bionic:
```
Traceback (most recent call last):
File "/usr/local/bin/mrkd", line 8, in <module>
sys.exit(main())
File "/usr/local/lib/python3.6/dist-packages/mrkd/__init__.py", line 261, in main
result = mistune.markdown(fp.read(), inline=inline, renderer=renderer)
File "/usr/lib/python3.6/encodings/ascii.py", line 26, in decode
return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 1856: ordinal not in range(128)
doc/Makefile:120: recipe for target 'doc/lightning-getinfo.7' failed
make: *** [doc/lightning-getinfo.7] Error 1
```
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
All build flags and (experimental) options make it hard to find
out what features are supported or enabled.
And the undocumented `--list-features-only`, does not account for all
our featurebits, for example bit 55 (keysend).
Changelog-Added: JSON-RPC: `getinfo` result now includes `our_features` (bits) for various Bolt #9 contexts
