[go] Fix fdio bootstrap structure

Part 1/N in removing libfdio dependency. This change reduces the number
of handles reserved for stdio streams and fixes some padding issues in
the struct.

Originally, sockets (which could've been the handles for stdio) were
implemented as "two unidirectional streams with a control channel", but
have since been reduced to encapsulation within a single handle. Since
the other handles are unused, we remove the reservation for them.

The struct was padded such that the environment string vector landed on
a 4-byte boundary, despite pointers always being 8-byte types on
Fuchsia. Unnecessary legacy padding is removed, and the name and type of
"unused2" is changed to more accurately reflect the intent of the
member. (The name "unused" could lead one to believe that it was part of
some now removed, deprecated protocol thing that still exists because
legacy.)

Change-Id: I75a8b1695401482707eeab1051172c2d0626dfc7
4 files changed
tree: 237db41c47580cd4aea2e2a097a56dd748d91bc9
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. BUILD.gn
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. favicon.ico
  15. LICENSE
  16. makefuchsia.go
  17. makeroot.go
  18. PATENTS
  19. README.md
  20. robots.txt
  21. VERSION
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