[FIX][gpacmp4/avilib.c]: Fix redefinition of VERSION and PACKAGE

[iha]

In raising this pull request, I confirm the following (please check boxes):

• I have read and understood the contributors guide.
• I have checked that another pull request for this purpose does not exist.
• I have considered, and confirmed that this submission will be valuable to others.
• I accept that this submission may not be used, and the pull request closed at the will of the maintainer.
• I give this submission freely, and claim no ownership to its content.

My familiarity with the project is as follows (check one):

• I have never used CCExtractor.
• I have used CCExtractor just a couple of times.
• I absolutely love CCExtractor, but have not contributed previously.
• I am an active contributor to CCExtractor.

---

This PR fixed these compiler warnings:

../src/gpacmp4/avilib.c:35:0: warning: "PACKAGE" redefined
#define PACKAGE "GPAC/avilib"

:0:0: note: this is the location of the previous definition
../src/gpacmp4/avilib.c:36:0: warning: "VERSION" redefined
#define VERSION GPAC_FULL_VERSION