delete compilation option "OLD_GINT"

Author: dzzz2001

CMakeLists.txt

@@ -253,9 +253,6 @@ if(ENABLE_LCAO)
     add_compile_definitions(__PEXSI)
     set(CMAKE_CXX_STANDARD 14)
   endif()
-  if(OLD_GINT)
-    add_compile_definitions(__OLD_GINT)
-  endif()
 else()
   set(ENABLE_MLALGO OFF)
   set(ENABLE_LIBRI OFF)