https://crbug.com/1122889 removed all defines for EGLAPI and
GL_APICALL when compiled with GCC. However, that made all symbols
of libEGL.so and libGLESv2.so hidden. Therefore SwiftShader
can't be used with Chromium anymore.

Bug: chromium:1122889
Change-Id: Ic05e7b5539537731141d945cf7944d07f4c389df
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/55048
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Commit-Queue: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>