video_core: Treat implicit conversions as errors

src/video_core/CMakeLists.txt

@@ -180,3 +180,9 @@ target_link_libraries(video_core PRIVATE glad)
 if (ENABLE_VULKAN)
     target_link_libraries(video_core PRIVATE sirit)
 endif()
+
+if (MSVC)
+    target_compile_options(video_core PRIVATE /we4267)
+else()
+    target_compile_options(video_core PRIVATE -Werror=conversion -Wno-sign-conversion)
+endif()