rename repacked macros so they don't clash with existing macros

[marcosps]

In the case a macro was using a symbol that was externalized, clang-extract recreates the macros using the externalized symbols. This works as expected. But depending on the includes, the created macro can clash with existing ones from included headers.

I suggest we take a similar strategy from klp-ccp, and add a klpr_ prefix to the macros.