Added missing include for the min/max macros in the Gizmo face slope limiter.

src/hydro/Gizmo/hydro_slope_limiters_face.h

@@ -32,9 +32,12 @@
 #ifndef SWIFT_GIZMO_SLOPE_LIMITER_FACE_H
 #define SWIFT_GIZMO_SLOPE_LIMITER_FACE_H
 
+/* Some standard headers. */
 #include <float.h>
 
+/* Local headers. */
 #include "sign.h"
+#include "minmax.h"
 
 __attribute__((always_inline)) INLINE static float
 hydro_slope_limit_face_quantity(float phi_i, float phi_j, float phi_mid0,

src/riemann/riemann_hllc.h

@@ -17,7 +17,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  ******************************************************************************/
-
 #ifndef SWIFT_RIEMANN_HLLC_H
 #define SWIFT_RIEMANN_HLLC_H