[Bug 254138] devel/cmake: aborts if CMAKE_CXX_STANDARD is set to empty

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254138

--- Comment #3 from Ed Maste <emaste at freebsd.org> ---
I observed this with catch2:

$ git clone https://github.com/catchorg/Catch2
$ cd Catch2
$ mkdir build
$ cd build
$ cmake -GNinja -DCMAKE_CXX_STANDARD= ..
-- The CXX compiler identification is Clang 11.0.1
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
Abort trap (core dumped)

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