Fix string literal comparison in validation String literals shouldn't be compared by pointer, especially if the literal is declared in a header (so the two pointers can come from different translation units, because the string literal might have a different copy in each). Use strcmp instead. Bug: angleproject:4175 Change-Id: I6002ccb185f48928b67ce8a7b3508e427761a8c3 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1940568 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>