C++/CMake: don't build structured code in embedded systems

cpp/src/CMakeLists.txt

@@ -1,12 +1,10 @@
 set(monoformat_SOURCES
     monoformat_schema.cpp
-    monoformat_structured.cpp
     monoformat_parseonly.cpp
     monoformat_fontreader.cpp
 )
 set(monoformat_HEADERS
     monoformat_schema.hpp
-    monoformat_structured.hpp
     monoformat_parsehelpers.hpp
     monoformat_parseonly.hpp
     monoformat_fontreader.hpp
@@ -14,6 +12,18 @@ set(monoformat_HEADERS
     monoformat_utf8.hpp
 )
 
+option(MONOFORMAT_EMBEDDED "Only build for embedded devices" FALSE)
+
+if(NOT MONOFORMAT_EMBEDDED)
+    list(APPEND monoformat_SOURCES
+        monoformat_structured.cpp
+    )
+
+    list(APPEND monoformat_HEADERS
+        monoformat_structured.hpp
+    )
+endif()
+
 add_library(monoformat ${monoformat_SOURCES} ${monoformat_HEADERS})
 target_compile_features(monoformat PUBLIC cxx_std_23)
 target_include_directories(monoformat PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})