cmake: headers: fixed paths
cmake: headers: fixed paths

cmake: headers: added the path to the generated c-ares
headers.

cmake: headers: changed the static jansson path with the
variable the same way the others so it doesn't have to be
changed next time the library gets updated.

Signed-off-by: Leonardo Alminana <7610bae85f2b530654cc716772f1fe653373e892@calyptia.com>

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