Remove linear filtering requirement on depth textures Linear filtering depth is an odd operation that doesn't yield particularly useful information. In the primary instance where it'd be used, the GLES3.1 spec (8.17) specifically denies its use, and enforcing the capability can lead to issues with hardware designed without support in mind. We think the check isn't necessary as a result. Bug: angleproject:5964 Change-Id: I69f243f7cc078cd5383de2cc4bf1cfc3b6f2bc3b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2894424 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>