Predefine (E)GL export macros.

Bug 18752589

Change-Id: I2a4fad80b433e62131d66f12bab2f73c6b16a9a0
Reviewed-on: https://swiftshader-review.googlesource.com/2962
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
67 files changed