Merge pull request #1966 from Lemno-Studio/contrib

FIX:	separated situation of building/installing on target_include_directories on cmake

Author: dsnopek

cmake/godotcpp.cmake

@@ -371,7 +371,9 @@ function(godotcpp_generate)
     target_include_directories(
         godot-cpp
         ${GODOTCPP_SYSTEM_HEADERS_ATTRIBUTE}
-        PUBLIC include ${CMAKE_CURRENT_BINARY_DIR}/gen/include
+        PUBLIC
+            $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/gen/include>
+            $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
     )
 
     # gersemi: off