Incorrect cmake variable name RUCKIG_VERSION should be ruckig_VERSION

[Levi-Armstrong]

No description provided.

[pantor]

While setting the variable RUCKIG_VERSION is superfluous in general (as we should just use ruckig_VERSION instead), both variables have the exact same value. I just double checked via:

if(${RUCKIG_VERSION} STREQUAL ${ruckig_VERSION})
  message(STATUS "Version string is equal.")
endif()

So what is the error that you're trying to fix?

[pantor]

I just cleaned this variable completely in 4f3e8c2.

[Levi-Armstrong]

The issue I ran into was when generating the Debian using cpack and it had an empty version. After this change the issue went away. Thanks for the fix.