[cmake] Disable deprecation warning in iOS builds

[enpe]

This change silences compiler warnings about the deprecation of the OpenGL API on iOS. The warning are similar to this:

.../ocean/impl/ocean/rendering/glescenegraph/GLESShaderProgram.h:448:28: 'glGetUniformLocation' is deprecated: first deprecated in iOS 12.0 - OpenGLES API deprecated. (Define GLES_SILENCE_DEPRECATION to silence these warnings)

Test plan:

Follow the instructions for building iOS apps with XCode and repeat this for the following apps:

• application_ocean_demo_base_console_ios
• application_ocean_demo_cv_detector_linedetector_ios
• application_ocean_demo_cv_detector_messengercode_ios
• application_ocean_demo_cv_detector_qrcodes_detector2d_ios
• application_ocean_demo_media_videopreview_ios
• application_ocean_demo_tracking_featuretracker_ios
• application_ocean_demo_tracking_homographyimagealigner_ios
• application_ocean_demo_tracking_homographytracker_ios
• application_ocean_demo_tracking_pointtracker_ios
• application_ocean_demo_tracking_similaritytracker_ios
• application_ocean_shark_ios

Observe that there are no longer any deprecation warnings about OpenGL.

[facebook-github-bot]

@thorntondr has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@thorntondr merged this pull request in facebookresearch/ocean@41c889b6762d036ab4fdf3cfbcb3559f34ef869a.