message: fix custom-matrix-format
  no autodetect such that no openmp in the top scope
diff: @@ -4,8 +4,8 @@ project(custom-matrix-format CXX CUDA)
  # We only need to find Ginkgo if we build this example stand-alone
  if (NOT GINKGO_BUILD_EXAMPLES)
  find_package(Ginkgo 1.5.0 REQUIRED)
  - find_package(OpenMP 3.0 REQUIRED)
  endif()
  +find_package(OpenMP 3.0 REQUIRED)
  if(NOT (GINKGO_BUILD_CUDA AND GINKGO_BUILD_OMP))
  message(FATAL_ERROR
  