win32: make "doc" dir for core install
distro-build: add missing dependency on "scribble-lib"
win32: fix destination of COPYING files in build
redex delim-cont example: fix `if' in `get-marks'

The `if' case of `get-marks' was missing subscripts, which
caused it not to match and defer to an `if' in `get-marks-core',
but `get-marks-core' is not supposed to have an `if' rule.
Fix the one in `get-marks' and removed it from `get-marks-core'.