fix build breaks

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/test/karr.cpp

@@ -43,7 +43,7 @@ namespace karr {
         hilbert_basis hb;
         for (unsigned i = 0; i < src.size(); ++i) {
             vector<rational> v(src.A[i]);
-            v.append(src.b[i]);
+            v.push_back(src.b[i]);
             hb.add_eq(v, rational(0));
         }
         for (unsigned i = 0; i < 1 + src.A[0].size(); ++i) {

src/util/bit_vector.cpp

@@ -18,6 +18,7 @@ Revision History:
 --*/
 
 #include"bit_vector.h"
+#include"util.h"
 #include"trace.h"
 
 #define DEFAULT_CAPACITY 2