* Fix Mac Build processes
For all:
Add Neon files to libpng for Apple Silicon
Update compilation.md documentation
For autoconf:
Make Linux and Mac Makefile.am and configure.ac identical
Fix wrong location for zvbi/bcd.h in both Mac/Linux
For cmake::
Include GPAC config for Darwin in Mac version
For mac/build.command:
Update for new zvbi location
* Update CHANGES.TXT for Mac Build commit
