Fix presubmit failure with recent glslang update Recent glslang update moved a #include inside a #if statement. The scripts/export_targets.py presubmit check doesn't know how to handle that so need to exclude the header in the script. Bug: angleproject:5294 Change-Id: I68563d59983ce2053f9e03c84b2736721db9fe95 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2518175 Commit-Queue: Courtney Goeltzenleuchter <courtneygo@google.com> Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>