[Clang] Slightly clean up __cpuidex_conflict.c

This was intended to be fixed in #154217, but given that didn't land, it
still needs to be done. I think it still makes sense to have this change
in.

Author: boomanaiden154

clang/test/Headers/__cpuidex_conflict.c

@@ -5,7 +5,7 @@
 
 // Ensure that we do not run into conflicts when offloading.
 // RUN: %clang_cc1 %s -DIS_STATIC=static -ffreestanding -fopenmp -fopenmp-is-target-device -aux-triple x86_64-unknown-linux-gnu
-// RUN: %clang_cc1 -DIS_STATIC="" -triple nvptx64-nvidia-cuda -aux-triple x86_64-unknown-linux-gnu -aux-target-cpu x86-64 -fcuda-is-device -internal-isystem /home/gha/llvm-project/build/lib/clang/22/include -x cuda %s -o -
+// RUN: %clang_cc1 -DIS_STATIC="" -triple nvptx64-nvidia-cuda -aux-triple x86_64-unknown-linux-gnu -aux-target-cpu x86-64 -fcuda-is-device -x cuda %s -o -
 
 typedef __SIZE_TYPE__ size_t;