CMake build scripts not including .spec files for wine bridge dlls

When building from source with the new cmake system, the resulting NPClient dll files don't work correctly - no errors during the build process or wine bridge installation, but the tester doesn't connect (it seems to be unresponsive when started via the gui, but running it from a cmd shell in the game's wine prefix shows an error message "Couldn't bind all necessary functions!" when the Start button is clicked)

I added ${SPEC_DEPS} to the list of parameters for the rules to build both 32- and 64-bit dlls to get it to work. I can probably submit a pull request with my solution later, but I'm submitting the issue report for now since I'm not sure how soon I'll get around to properly setting up my fork for that purpose.