Silence a few warnings.

opm/io/eclipse/EGrid.hpp

@@ -72,7 +72,7 @@ private:
     std::array<int, 3> nijk;
     std::array<int, 3> host_nijk;
 
-    int nactive, m_nncs;
+    int nactive;
     mutable bool m_nncs_loaded;
 
     std::vector<int> act_index;

opm/parser/eclipse/EclipseState/Aquifer/NumericalAquifer/SingleNumericalAquifer.hpp

@@ -28,7 +28,7 @@
 
 namespace Opm {
     class NNC;
-    class NNCdata;
+    struct NNCdata;
     class FieldPropsManager;
 
     struct AquiferCellProps {

tests/parser/RestartConfigTests.cpp

@@ -36,8 +36,6 @@ inline std::string fst( const std::pair< std::string, int >& p ) {
     return p.first;
 }
 
-constexpr std::pair<std::time_t, std::size_t> restart_info = std::make_pair(std::time_t{0}, std::size_t{0});
-
 const std::string grid = R"(
 RUNSPEC
 DIMENS

tests/parser/ScheduleTests.cpp

@@ -1326,21 +1326,6 @@ VAPPARS
 
 }
 
-
-BOOST_AUTO_TEST_CASE(createDeckWithOutOilVaporizationProperties) {
-    std::string input = R"(
-START             -- 0
-19 JUN 2007 /
-SCHEDULE
-DATES             -- 1
- 10  OKT 2008 /
-/
-)";
-
-    const auto& schedule = make_schedule(input);
-}
-
-
 BOOST_AUTO_TEST_CASE(changeBhpLimitInHistoryModeWithWeltarg) {
     std::string input = R"(
 START             -- 0