Use the libretro VFS interface in libretro builds

Common/UI/IconCache.cpp

@@ -6,6 +6,7 @@
 #include "Common/Data/Format/PNGLoad.h"
 #include "Common/Log.h"
 #include "Common/GPU/thin3d.h"
+#include "Common/File/FileUtil.h"
 
 #define ICON_CACHE_VERSION 1
 #define MK_FOURCC(str) (str[0] | ((uint8_t)str[1] << 8) | ((uint8_t)str[2] << 16) | ((uint8_t)str[3] << 24))
@@ -88,7 +89,7 @@ bool IconCache::LoadFromFile(FILE *file) {
 		// Check if we already have the entry somehow.
 		if (cache_.find(key) != cache_.end()) {
 			// Seek past the data and go to the next entry.
-			fseek(file, entryHeader.dataLen, SEEK_CUR);
+			File::Fseek(file, entryHeader.dataLen, SEEK_CUR);
 			continue;
 		}