autodiff should not install with teqp

As best as I can tell

CMakeLists.txt

@@ -147,7 +147,7 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/external
 set(AUTODIFF_BUILD_TESTS FALSE CACHE BOOL "No autodiff tests")
 set(AUTODIFF_BUILD_PYTHON FALSE CACHE BOOL "No autodiff python")
 set(AUTODIFF_BUILD_EXAMPLES FALSE CACHE BOOL "No autodiff examples")
-add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/externals/autodiff")
+add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/externals/autodiff" EXCLUDE_FROM_ALL)
 
 # Turn on more useful diagnostic messages in nlohmann::json, for instance if you are accessing a field that doesn't exist
 set(JSON_Diagnostics TRUE CACHE BOOL "Turn on more helpful diagnostics in nlohmann::json")