`path_exists` in ext_path.h does not exist

A fully documented and quite useful function in ext_path.h is not available to be linked somehow using max-sdk-base :

Undefined symbols for architecture arm64:
  "_path_exists", referenced from:
      ck_run_file(_ck*) in chuck_tilde.cpp.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)