CMake: misused variables from top level project

[AlexVeprev]

@arihannu found multiple CMake-related issues in scope of #207.
I'm moving them into separate issues for better tracking:

• CMakeLists.txt#L190 and other install instructions: CMAKE_PROJECT_NAME should be replaced with PROJECT_NAME.
• cmake/vars_utils.cmake#L25 and other instructions in this file: paths should be built based on CMAKE_CURRENT_SOURCE_DIR instead of CMAKE_SOURCE_DIR.

[AlexVeprev]

@arihannu the issue should be addressed with a recent commit to master branch. Could you please check if it works for you?

[arihannu]

@AlexVeprev Hi, just tried master branch and CMake configuration and build passed without problems. Are you going to include these fixes into an official branch or should I just use master branch from now on?

[AlexVeprev]

@arihannu, thank you for the verification! The fix should be available in onetbb_2021 with the next release (unfortunately I can't provide timeline for now). Generally the master branch should be updated more frequently than onetbb_2021. If you prefer to use official releases you can rely on onetbb_2021 and/or on tags v2021..., otherwise use master for the most recent sources.

[arihannu]

@AlexVeprev Then I think this issue can be closed. Thanks for the support.