Add accidentally removed -D

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@202355 91177308-0d34-0410-b5e6-96231b3b80d8
[CMake] Make sure add_compiler_rt_resource_file doesn't do unnecessary work

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@202356 91177308-0d34-0410-b5e6-96231b3b80d8