Define Haiku assets path

Source/utils/paths.cpp

@@ -7,6 +7,11 @@
 #include "utils/log.hpp"
 #include "utils/sdl_ptrs.h"
 
+#ifdef __HAIKU__
+#include <FindDirectory.h>
+#include <fs_info.h>
+#endif
+
 #ifdef __IPHONEOS__
 #include "platform/ios/ios_paths.h"
 #endif
@@ -114,6 +119,12 @@ const std::string &ConfigPath()
 const std::string &AssetsPath()
 {
 	if (!assetsPath) {
+#if defined(__HAIKU__)
+		char buffer[B_PATH_NAME_LENGTH+10];
+		find_directory(B_SYSTEM_DATA_DIRECTORY, dev_for_path("/boot"), false, buffer, B_PATH_NAME_LENGTH);
+		strcat(buffer, "/devilutionx/");
+		assetsPath.emplace(strdup(buffer));
+#endif
 #if __EMSCRIPTEN__
 		assetsPath.emplace("assets/");
 #elif defined(NXDK)