CMakeLists: Treat ignored-qualifiers warnings as errors.

Android builds fail for this warning.

Bug: b/130335507
Bug: b/130461662
Change-Id: I2c5be9199f9a393d477345c194cdf940cc7404eb
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29870
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
diff --git a/CMakeLists.txt b/CMakeLists.txt
index bd66b51..cfbad8e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -242,6 +242,7 @@
             "-Werror=unused-lambda-capture"
             "-Werror=string-conversion"
             "-Werror=extra-semi"
+            "-Werror=ignored-qualifiers"
         )
     endif()