HPM compatibility improvements

Improved compatibility, portability and standards conformance.

- Since it is not possible to portably and reliably re-use the core's
  symbols in plugins, symbols are no longer exported unless explicitly
  required, in the UNIX builds. This mimics the Windows behavior and
  adds HPM compatibility to OSes such as FreeBSD. Credits to Andrei Karas
  for making this possible.
- For convenience, it is no longer necessary to call GET_SYMBOL, since
  the plugin will automatically import all the available symbols when
  it's loaded, depending on the included headers.
- Plugins are now supposed to include the "common/hercules.h" header
  before including anything else.  Incluing common/HPMi.h,
  common/cbasetypes.h or conf/core.h is no longer necessary, as those
  are guaranteed to be automatically included by hercules.h.
- HPM API version bumped to 1.1.

Signed-off-by: Haru <haru@dotalux.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/map/trade.h b/src/map/trade.h
index 85e73025c..010f67e26 100644
--- a/src/map/trade.h
+++ b/src/map/trade.h
@@ -5,6 +5,8 @@
 #ifndef MAP_TRADE_H
 #define MAP_TRADE_H
 
+#include "common/hercules.h"
+
 //Max distance from traders to enable a trade to take place.
 //TODO: battle_config candidate?
 #define TRADE_DISTANCE 2
@@ -23,10 +25,10 @@ struct trade_interface {
 	void (*commit) (struct map_session_data *sd);
 };
 
-struct trade_interface *trade;
-
 #ifdef HERCULES_CORE
 void trade_defaults(void);
 #endif // HERCULES_CORE
 
+HPShared struct trade_interface *trade;
+
 #endif /* MAP_TRADE_H */