…ion validation (#6348) (#6377)

I went quite overboard when I introduced the validation of the define.
That was not necessary in CMake as we provide feedback on the usage of
the matchcompiler. So only handle the special options and otherwise rely
on the regular CMake logic.

(cherry picked from commit c4be14d)

(cherry picked from commit 1943b4d)

Co-authored-by: chrchr-github <78114321+chrchr-github@users.noreply.github.com>

…ort should be provided.) (#6419)

…on tool button is deselected) (#6440)

…from `determineCppC()` (#6326) (#6429)

(cherry picked from commit ca94527)

…` when a language is enforced (#6447)

cherry pick from 9c21862

Co-authored-by: Oliver Stöneberg <firewave@users.noreply.github.com>

cherry picked 9d4d118

Co-authored-by: olabetskyi <153490942+olabetskyi@users.noreply.github.com>