solvers: also link MiniSat2 options

To be able to parse options again when setting up a solver, the
parseOption method has to be present. Hence, link against the
Options.cc file of MiniSat2 as well.

Signed-off-by: Norbert Manthey <nmanthey@amazon.de>

Author: nmanthey

src/solvers/Makefile

@@ -17,7 +17,7 @@ endif
 ifneq ($(MINISAT2),)
   MINISAT2_SRC=sat/satcheck_minisat2.cpp
   MINISAT2_INCLUDE=-I $(MINISAT2)
-  MINISAT2_LIB=$(MINISAT2)/minisat/simp/SimpSolver$(OBJEXT) $(MINISAT2)/minisat/core/Solver$(OBJEXT)
+  MINISAT2_LIB=$(MINISAT2)/minisat/simp/SimpSolver$(OBJEXT) $(MINISAT2)/minisat/core/Solver$(OBJEXT) $(MINISAT2)/minisat/utils/Options$(OBJEXT)
   CP_CXXFLAGS += -DHAVE_MINISAT2 -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
   CLEANFILES += $(MINISAT2_LIB) $(patsubst %$(OBJEXT), %$(DEPEXT), $(MINISAT2_LIB))
 endif