[OpenMP][OMPD] Fix compile error when OMPD is not supported

Differential Revision: https://reviews.llvm.org/D110120

Change-Id: I9d39dacfab5b7fbab37ee4b4d960d51e0892b24d

Author: UsmanNadeem

openmp/runtime/CMakeLists.txt

@@ -411,3 +411,4 @@ set(LIBOMP_LIBRARY_DIR ${LIBOMP_LIBRARY_DIR} PARENT_SCOPE)
 set(LIBOMP_INCLUDE_DIR ${LIBOMP_INCLUDE_DIR} PARENT_SCOPE)
 # make these variables available for tools/libompd:
 set(LIBOMP_SRC_DIR ${LIBOMP_SRC_DIR} PARENT_SCOPE)
+set(LIBOMP_OMPD_SUPPORT ${LIBOMP_OMPD_SUPPORT} PARENT_SCOPE)