`ccov-clean` not compatible on Windows about cmake-scripts

[StableCoder]

Fixed via 2a6517a.

In this particular case, cmake -E rm was only added to CMake with v3.17.0. I've added a workaround for prior versions that uses the older cmake -E remove command instead.

[StableCoder]

Hi.

I've updated that to be platform agnostic as of 1d4bcb4. This should allow builds of individual ccov targets on Windows.

Unfortunately, the ccov-all* targets are still non-functional on Windows, and I'm still trying to figure out a solution.

[mscofield0]

Thanks for the quick fix. Closing this now.

[mscofield0]

Seems like the Linux version isn't working now:

$ cmake --build build/test --target ccov
[0/2] Re-checking globbed directories...
[1/13] cd .../build/test/ccov/profraw.list
FAILED: CMakeFiles/ccov-clean
cd .../build/test && /usr/bin/cmake -E rm -f .../build/test/ccov/binaries.list && /usr/bin/cmake -E rm -f .../build/test/ccov/profraw.list
CMake Error: cmake version 3.16.3
Usage: /usr/bin/cmake -E <command> [arguments...]