In some cases of ternary operators etc.
we still create useless temporary variables with type "void".
Until this is fixed, disable the too-strict checks
for variables with type void
(see #166).

git-svn-id: https://svn.sosy-lab.org/software/cpachecker/trunk@14386 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c