fix cmake bug (#5929)

Author: dzzz2001

cmake/FindMKL.cmake

@@ -83,7 +83,7 @@ endif()
 endif() # MKL::MKL
 
 # For compatibility with legacy libpaw_interface CMakeLists.txt
-if(TARGET MKL::MKL)
+if(TARGET MKL::MKL AND NOT TARGET IntelMKL::MKL)
   add_library(IntelMKL::MKL ALIAS MKL::MKL)
 endif()