Small changes to get things building and running on Linux/ARM.

ninja -C out/Debug works, and I tested out/Debug/dm --nogpu (no X yet).

The only problems encountered were:
  - Like CrOS, I also needed to use the default float ABI (presumably hard).
  - The strings in GrBinHashKeyTest weren't necessarily 4-byte aligned.

BUG=skia:

Review URL: https://codereview.chromium.org/746043002
2 files changed