Add the function msat_make_int_modular_congruence to the native api of
our MathSAT wrapper (will be available when MathSAT is recompiled).

git-svn-id: https://svn.sosy-lab.org/software/cpachecker/trunk@14014 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c