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Since atspi-2 does not support getting version information at compile
time, we must do this manually with pkg-config. Add defines for the
versions of atspi-2 that we care about and guard newer enum values with
those defines.

Bug: 887908
Change-Id: I8eecb2eeada48cc2176117b764adbf77b26ce351
Reviewed-on: https://chromium-review.googlesource.com/c/1238437
Commit-Queue: Martin Robinson <mrobinson@igalia.com>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#598863}