MODPLUG_EXPORT support Watcom compiler.

Author: sezero

src/libmodplug/stdafx.h

@@ -137,6 +137,12 @@ inline void ProcessPlugins(int n) { (void)n; }
 # else
 #   define MODPLUG_EXPORT __declspec(dllimport)			/* using libmodplug dll for windows */
 # endif
+#elif defined(__OS2__) && defined(__WATCOMC__)
+# if defined(MODPLUG_BUILD) && defined(__SW_BD)		/* building libmodplug as a dll for os/2 */
+#   define MODPLUG_EXPORT __declspec(dllexport)
+# else
+#   define MODPLUG_EXPORT					/* using dll or static libmodplug for os/2 */
+# endif
 #elif defined(MODPLUG_BUILD) && defined(SYM_VISIBILITY)
 #   define MODPLUG_EXPORT __attribute__((visibility("default")))
 #else

src/modplug.h

@@ -19,6 +19,12 @@ extern "C" {
 # else
 #   define MODPLUG_EXPORT __declspec(dllimport)			/* using libmodplug dll for windows */
 # endif
+#elif defined(__OS2__) && defined(__WATCOMC__)
+# if defined(MODPLUG_BUILD) && defined(__SW_BD)		/* building libmodplug as a dll for os/2 */
+#   define MODPLUG_EXPORT __declspec(dllexport)
+# else
+#   define MODPLUG_EXPORT					/* using dll or static libmodplug for os/2 */
+# endif
 #elif defined(MODPLUG_BUILD) && defined(SYM_VISIBILITY)
 #   define MODPLUG_EXPORT __attribute__((visibility("default")))
 #else
@@ -182,4 +188,4 @@ MODPLUG_EXPORT void ModPlug_UnloadMixerCallback(ModPlugFile* file) ;
 } /* extern "C" */
 #endif
 
-#endif
+#endif /* MODPLUG_H__INCLUDED */