Ninja: fix ARMClang paths for Windows

Martin Kojtalrequested to merge
0xc0170/cmake:fix-issue-#21093 into master

We need to escape paths for ARMClang on Windows, see the referenced issue for more details.

Tested with Mbed OS master branch, ARMClang 6.14 and blinky example. I modified our CMake to force response files for Ninja generator. Without this fix, it fails to build (it can't find header files, paths are incorrectly escaped). I applied this fix, and was able to build it without any errors on Windows platform.

Fixes: #21093 (closed)
Backport: release
Topic-rename: ninja-armclang-windows

Edited by Brad King

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