Fix string literal comparison in validation
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 <582eeec4f08a2ccd61e3ef52115e6e7c571582de@chromium.org>
Reviewed-by: Jonah Ryan-Davis <682bdb9e7d8ba359ef169b8db374e7a99d394a46@google.com>
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle