This should fix a couple warnings seen in the Linux CI

src/game/boe.specials.cpp

@@ -4725,4 +4725,5 @@ iLiving& current_pc_picked_in_spec_enc(const runtime_state& ctx) {
 				return *targ;
 			else return univ.party;
 	}
+	BOOST_UNREACHABLE_RETURN(*ctx.cur_target);
 }

src/gfx/render_shapes.cpp

@@ -15,7 +15,7 @@
 #include "render_image.hpp"
 
 using boost::math::constants::pi;
-using pt_idx_t = decltype(((sf::Shape*)nullptr)->getPointCount());
+using pt_idx_t = decltype(std::declval<sf::Shape>().getPointCount());
 
 std::map<std::string,sf::Color> colour_map = {
 	{"white", Colours::WHITE},