Fix expression usage of CBinaryExpressionBuilder:
because this class is used by code outside of its package,
it may not use the package-interal CFAGenerationRuntimeException.

git-svn-id: https://svn.sosy-lab.org/software/cpachecker/trunk@14376 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c