https://reviews.llvm.org/D143017

[Libomptarget] Fix disabling amdgpu on non-Linux.

Previously, on non-Linux, amdgpu would get enabled whatever the CPU
architecture.

Index: llvm-toolchain-15-15.0.7/openmp/libomptarget/plugins/amdgpu/CMakeLists.txt
===================================================================
--- llvm-toolchain-15-15.0.7.orig/openmp/libomptarget/plugins/amdgpu/CMakeLists.txt
+++ llvm-toolchain-15-15.0.7/openmp/libomptarget/plugins/amdgpu/CMakeLists.txt
@@ -27,7 +27,7 @@ if(NOT LIBOMPTARGET_DEP_LIBELF_FOUND)
   return()
 endif()
 
-if(NOT CMAKE_SYSTEM_PROCESSOR MATCHES "(x86_64)|(ppc64le)|(aarch64)$" AND CMAKE_SYSTEM_NAME MATCHES "Linux")
+if(NOT (CMAKE_SYSTEM_PROCESSOR MATCHES "(x86_64)|(ppc64le)|(aarch64)$" AND CMAKE_SYSTEM_NAME MATCHES "Linux"))
   libomptarget_say("Not building AMDGPU plugin: only support AMDGPU in Linux x86_64, ppc64le, or aarch64 hosts")
   return()
 endif()