fuchsia: Make EINTR macros no-ops
fuchsia: Make EINTR macros no-ops

Bug: crashpad:196
Change-Id: If94dc563c74679b06cc7feca86fde52a9a7d0e7f
Reviewed-on: https://chromium-review.googlesource.com/804996
Reviewed-by: Mark Mentovai <f1b5a91d4d6ad523f2610114591c007e75d15084@chromium.org>

chromium/mini_chromium,chromium/mini_chromium,chromium/mini_chromium