Buildsystem: Make core buildable under Windows again

- changed OpenSSL detection of headers around slightly
- changed paths to MySQL-headers on Windows in a few files
- removed precompiled header for scripts being built when building game
- added requirement of building revision.h to be built before building shared
- added some generic buildfixes (thanks zor)
- use resource-files, allowing for icons to show up on windows

--HG--
branch : trunk

src/server/game/Weather/Weather.h

@@ -31,6 +31,20 @@
 
 class Player;
 
+#define WEATHER_SEASONS 4
+struct WeatherSeasonChances
+{
+    uint32 rainChance;
+    uint32 snowChance;
+    uint32 stormChance;
+};
+
+struct WeatherData
+{
+    WeatherSeasonChances data[WEATHER_SEASONS];
+    uint32 ScriptId;
+};
+
 enum WeatherState
 {
     WEATHER_STATE_FINE              = 0,