Emulate Windows DLL behaviour when exporting symbols for libcrown.so

engine/CMakeLists.txt

@@ -387,7 +387,7 @@ if (LINUX)
 		-g
 		-pg
 		-fPIC
-		-Wl,-E
+		-fvisibility=hidden
 	)
 
 	set (CROWN_EXECUTABLE_NAME crown-linux)

engine/core/Types.h

@@ -34,7 +34,7 @@ OTHER DEALINGS IN THE SOFTWARE.
 #ifdef WINDOWS
 	#define CE_EXPORT __declspec(dllexport)
 #else
-	#define CE_EXPORT
+	#define CE_EXPORT __attribute__ ((visibility("default")))
 #endif
 
 #ifndef NULL