Fix #643. Industry cart pushers carrying more than one load per trip.

Cap common_spawn_goods_output_cartpusher at UNITS_PER_LOAD so hunting lodge
and similar buildings match vanilla 100-unit cart loads.

Author: s.kushnirenko

src/building/building.cpp

@@ -823,7 +823,8 @@ figure* building::common_spawn_goods_output_cartpusher(int min_carry, int max_ca
 
     int stored_resources = stored_amount(output.resource);
     if (stored_resources >= min_carry) {
-        int amounts_to_carry = std::min<int>(stored_resources, max_carry);
+        const int carry_cap = std::min(max_carry, UNITS_PER_LOAD);
+        int amounts_to_carry = std::min<int>(stored_resources, carry_cap);
         amounts_to_carry -= amounts_to_carry % 100; // remove pittance
 
         figure* f = create_cartpusher(output.resource, amounts_to_carry, (e_figure_action)ACTION_20_CARTPUSHER_INITIAL, BUILDING_SLOT_CARTPUSHER);

src/building/building.h

@@ -334,7 +334,7 @@ class building {
     int figure_spawn_timer();
     void check_labor_problem();
     void common_spawn_labor_seeker(int min_houses);
-    figure* common_spawn_goods_output_cartpusher(int min_carry = 100, int max_carry = 800);
+    figure* common_spawn_goods_output_cartpusher(int min_carry = 100, int max_carry = 100);
     bool workshop_has_resources();
 
     void force_damage(e_damage_type type, int16_t value);