[llvm] [openmp] [flang-rt][CMake] Avoid 'use, intrinsic ::' (PR #205634)

[Nikita Popov via llvm-commits]

nikic wrote:

Unfortunately I'm still seeing `The __ppc_types module was not found ` when building mma.f90 on PowerPC. Though the failure is intermittent now.

https://github.com/llvm/llvm-project/pull/205634