Revert "skip src folder also to save build time on windows"

This reverts commit 3a27df4.

Author: wptestyyh

CMakeLists.txt

@@ -100,9 +100,10 @@ endif()
 if (BUILD_FOR_LINUX)
   add_subdirectory(config)
   add_subdirectory(packaging)
-  add_subdirectory(src)
 endif()
 
+add_subdirectory(src)
+
 if (NOT NETREMOTE_EXCLUDE_API OR NOT NETREMOTE_EXCLUDE_API_BINDINGS)
   add_subdirectory(api)
 endif()