only ensure local vars for definitions during expansion when compiling

only ensure local vars for definitions during expansion when compiling

* module/ice-9/psyntax.scm (chi-top): Only modify the compile-time
  environment to indicate that there is a local binding if we are
  running in compile mode. Otherwise some eval-when things might not
  have gotten executed, and our current-module could be wrong.

* module/ice-9/psyntax-pp.scm: Regenerate.