make it so clang can build wpilib

Clang intentionally implements something different than the standard
because the standard is weird (I agree). See
<http://llvm.org/bugs/show_bug.cgi?id=6840> and
<http://stackoverflow.com/questions/3584385/friend-access-to-protected-nested-class#answer-3585613>
for details.

Change-Id: Iabc5f3f50bb7023184e1092f5210ec27fcd191da
1 file changed
tree: 56d684faca3b5d533c370d3e1ed15d541c4f084a
  1. aos/
  2. doc/
  3. frc971/
  4. output/
  5. vision/
  6. .clang-format
  7. .gitignore
  8. README.txt