Indent options files to two spaces

[bgilbert]

#1975 indented them to four spaces, which is inconsistent with the settings for meson.build.

[eli-schwartz]

IMHO 4 spaces is a nice default and maybe we should just be consistent about that. It's also the same one python uses.

[bgilbert]

The Meson docs seem to consistently use two spaces for meson.build example code. While the docs don't seem to have an opinion for options files, it feels inconsistent to have a different convention there.

[eli-schwartz]

Yes but I am opinionated and think the docs made a mistake. :P

What would the world be without opinion about "tabs vs spaces? 2 spaces or 4?" anyway.

Note as well that I believe the formatter defaults to it.

[bgilbert]

I'm actually not a fan of two-space indents, but there's some value in being minimally confusing.

Since the indentation part is controversial, I'll break out the fixup commits into a separate PR.

[jpakkane]

Two spaces was my mistake. Four would be better because that is what everybody else uses by default.

[Totto16]

The .editorconfig says:

[*.py]
indent_size = 4

[meson.build]
indent_size = 2

so adjust it there too

[dcbaker]

I'm a big fan of two space indent and not a fan of 4 space indent, and I have at least one practical reason for liking it:

if (really_long conditional
    that goes more than one line)
    'What this is unclear!'
endif

if (long
    line 2)
  'this is more readable'
endif