Update Blueback compilers.yaml: add missing path to llvm-ar etc. (#1622)

Author: climbfuji

configs/sites/tier1/blueback/compilers.yaml

@@ -60,6 +60,8 @@ compilers::
     - libfabric/1.20.1
     environment:
       prepend_path:
+        # The Cray compiler module does not include llvm-ar and other tools in the path
+        PATH: '/p/app/intel/oneapi-combined/compiler/2025.0/bin/compiler'
         LD_LIBRARY_PATH: '/opt/cray/libfabric/1.20.1/lib64:/opt/cray/pe/libsci/24.07.0/INTEL/2023.2/x86_64/lib'
       set:
         CONFIG_SITE: ''