CMake: convert TBB_SIGNTOOL path TO_CMAKE_PATH

[AlexVeprev]

Signed-off-by: Veprev, Alexey alexey.veprev@intel.com

Description

Add comprehensive description of proposed changes

This small fix is required to avoid possible warning Invalid escape sequence if TBB_SIGNTOOL is specified in Windows-style (with \) and some escape sequences accidentally appear in that path

Fixes # - issue number(s) if exists -

• - git commit message contains appropriate signed-off-by string (see CONTRIBUTING.md for details)

Type of change

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• bug fix - change which fixes an issue
• new feature - change which adds functionality
• tests - change in tests
• infrastructure - change in infrastructure and CI
• documentation - documentation update

Tests

• added - required for new features and for some bug fixes
• not needed

Documentation

• updated in # - add PR number
• needs to be updated
• not needed

Breaks backward compatibility

• Yes
• No
• Unknown

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