[Build] Disable sm_90a in cu11 (#5141)

CMakeLists.txt

@@ -200,11 +200,13 @@ if(VLLM_GPU_LANG STREQUAL "CUDA")
   # The CUTLASS kernels for Hopper require sm90a to be enabled.
   # This is done via the below gencode option, BUT that creates kernels for both sm90 and sm90a.
   # That adds an extra 17MB to compiled binary, so instead we selectively enable it.
+  if(${CMAKE_CUDA_COMPILER_VERSION} VERSION_GREATER 11)
     set_source_files_properties(
           "csrc/quantization/cutlass_w8a8/scaled_mm_dq_c3x.cu"
           PROPERTIES
           COMPILE_FLAGS
           "-gencode arch=compute_90a,code=sm_90a")
+  endif()
 
 endif()