feat: add conditional inclusion support to header parser

modules/java/generator/CMakeLists.txt

@@ -56,6 +56,12 @@ foreach(m ${OPENCV_JAVA_MODULES})
   ocv_remap_files(misc_files)
 endforeach(m)
 
+include("${OpenCV_SOURCE_DIR}/cmake/OpenCVBindingsPreprocessorDefinitions.cmake")
+ocv_bindings_generator_populate_preprocessor_definitions(
+  OPENCV_MODULES_BUILD
+  opencv_preprocessor_defs
+)
+
 set(CONFIG_FILE "${CMAKE_CURRENT_BINARY_DIR}/gen_java.json")
 set(__config_str
 "{
@@ -63,6 +69,9 @@ set(__config_str
   \"modules\": [
 ${__modules_config}
   ],
+  \"preprocessor_definitions\": {
+${opencv_preprocessor_defs}
+  },
   \"files_remap\": [
 ${__remap_config}
   ]