(vfs_implementation_cdrom) Silence warnings with these header includes

Author: LibretroAdmin

libretro-common/vfs/vfs_implementation_cdrom.c

@@ -20,6 +20,9 @@
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
+#include <stdlib.h>
+#include <string.h>
+
 #include <vfs/vfs_implementation.h>
 #include <file/file_path.h>
 #include <compat/fopen_utf8.h>