[OpenMP] CUDA plugin: add include directory for libelf

Allow the user to manually specify where libelf is installed.

Differential Revision: https://reviews.llvm.org/D31207



git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@298515 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed