Merge pull request #2488 from ERGO-Code/cpack

Include CPack check

Author: jajhall

CMakeLists.txt

@@ -500,7 +500,10 @@ if(ZLIB AND NOT TARGET ZLIB::ZLIB)
   find_package(ZLIB 1.2.3)
 endif()
 
-include(CPack)
+if(CPack_CMake_INCLUDED EQUAL 0)
+  include(CPack)
+endif()
+
 set(CPACK_PACKAGE_VERSION_MAJOR "${HIGHS_VERSION_MAJOR}")
 set(CPACK_PACKAGE_VERSION_MINOR "${HIGHS_VERSION_MINOR}")
 set(CPACK_PACKAGE_VERSION_PATCH "${HIGHS_VERSION_PATCH}")