[libomptarget][nfc][amdgcn] Use precise triple for devicertl build

GitOrigin-RevId: bb38d7ff05c2ed91ef01d7f15454faec6540b839
diff --git a/libomptarget/deviceRTLs/amdgcn/CMakeLists.txt b/libomptarget/deviceRTLs/amdgcn/CMakeLists.txt
index f1ec822..8ba0572 100644
--- a/libomptarget/deviceRTLs/amdgcn/CMakeLists.txt
+++ b/libomptarget/deviceRTLs/amdgcn/CMakeLists.txt
@@ -102,7 +102,7 @@
     -c
     -std=c++14
     -ffreestanding
-    -target amdgcn
+    -target amdgcn-amd-amdhsa
     -emit-llvm
     -Xclang -aux-triple -Xclang x86_64-unknown-linux-gnu # see nvptx
     -fopenmp -fopenmp-cuda-mode -Xclang -fopenmp-is-device