CYTHON_TRACE must be set when generating coverage

Setting of this proprocessor variable went missing in the move to
cmake + scikit-build, resulting in coverage not going through Cython
files anymore. This change should restore that, and thus improve the
coverage percentage.

Author: oleksandr-pavlyk

dpctl/CMakeLists.txt

@@ -111,6 +111,9 @@ function(build_dpctl_ext _trgt _src _dest)
     add_library(${_trgt} MODULE ${_generated_src})
     target_include_directories(${_trgt} PRIVATE ${NumPy_INCLUDE_DIR} ${DPCTL_INCLUDE_DIR})
     add_dependencies(${_trgt} _build_time_create_dpctl_include)
+    if(DPCTL_GENERATE_COVERAGE)
+       target_compile_definitions(${_trgt} PRIVATE CYTHON_TRACE)
+    endif()
     target_link_libraries(${_trgt} DPCTLSyclInterface)
     target_link_options(${_trgt} PRIVATE "LINKER:${DPCTL_LDFLAGS}")
     python_extension_module(${_trgt})