Propagate macro to disable vast if it's disabled in the build

CMakeLists.txt

@@ -154,6 +154,18 @@ add_library("multiplier" SHARED
   "${PROJECT_BINARY_DIR}/Version.cpp"
 )
 
+if(NOT MX_ENABLE_VAST)
+  target_compile_definitions("multiplier"
+    PUBLIC
+      "MX_DISABLE_VAST")
+endif()
+
+if(NOT MX_ENABLE_PYTHON_BINDINGS)
+  target_compile_definitions("mx-api"
+    PUBLIC
+      "MX_DISABLE_PYTHON_BINDINGS")
+endif()
+
 set_target_properties("multiplier"
   PROPERTIES
     LINKER_LANGUAGE