Merge branch 'js/ps-build-cmake-fixup'

Build fixes for Windows.

* js/ps-build-cmake-fixup:
  cmake/vcxproj: stop special-casing `remote-ext`
  cmake: put the Perl modules into the correct location again
  cmake: use the correct file name for the Perl header
  cmake(mergetools): better support for out-of-tree builds
  cmake: better support for out-of-tree builds follow-up