Add aliases Check::check and Check::checkShared
Add aliases Check::check and Check::checkShared

https://github.com/libcheck/check/issues/238
Getting things to work with CMake's FetchContent

These aliases make it easier to use Check as a sub project in CMake.
Now the "interface" is the same as using Check as an external project or
as a library installed in the system.

libcheck/check,libcheck/check,libcheck/check,libcheck/check,libcheck/check