fix message for options in CMakeLists

[fmessmer]

I guess the messages have been copy-pasted and not adjusted according to the respective cases

[fmessmer]

on a side note:
we are using catkin-tools to build our workspaces, i.e. catkin build
I can set my desired cmake-args with

catkin config -DLDMRS=1 -DSCANSEGMENT_XD=0 -DBUILD_WITH_LDMRS_SUPPORT=True -DCMAKE_BUILD_TYPE=Release -DCMAKE_EXPORT_COMPILE_COMMANDS=ON

but that still fails because the dependency declaration in the package.xml is hidden behind an environment variable condition and thus sick_scan_xd does not wait for libsick_ldmrs to be finished - despite the cmake-args
the only ways to enforce the proper build order are:

• removing the condition in package.xml
• or run BUILD_WITH_LDMRS_SUPPORT=True catkin build instead of just catkin build

maybe catkin_make_isolated handles this differently and its just a catkin-tools thing
I just wanted to mention it here as it makes integrating sick_scan_xd into our source workspace quite tricky

the best solution of course would be #105
😉

[rostest]

Thanks for your pull request! The cmake options and help texts are currently shown by cmake-gui, e.g.:

To describe the optional cmake settings as clear as possible, we will add some further explanation in the help text. E.g.: