obs-qsv11: Fix missing ENABLE_HEVC definition for test executable

plugins/obs-qsv11/obs-qsv-test/CMakeLists.txt

@@ -5,6 +5,7 @@ legacy_check()
 add_executable(obs-qsv-test)
 
 target_sources(obs-qsv-test PRIVATE obs-qsv-test.cpp)
+target_compile_definitions(obs-qsv-test PRIVATE "$<$<BOOL:${ENABLE_HEVC}>:ENABLE_HEVC>")
 target_link_libraries(obs-qsv-test d3d11 dxgi dxguid OBS::libmfx OBS::COMutils)
 
 # cmake-format: off