libeffects: do not use GNU old-style field designators

Avoiding the use of GCC extensions improves code portability

Change-Id: I9edbedc5c8ad4aa46ca54bc2e28280441431a530
Long mp3 metadata displays as corrupted file after transfer

Cut the metadata to 1 Byte and return in function
getObjectPropertyList in order to show it properly on a PC.

Change-Id: Iefacf9fa86c20ece2572e6d95d35877a94066fe7