macos: Fix the install_name for the GStreamer framework
Ever since we moved to a relocatable prefix for the framework,
self.config.prefix
is no longer /Library/Frameworks/GStreamer.framework/Versions/1.0
It is now inside the builddir, so we need it to be relative to @rpath
similar to other paths in the binary like:
@rpath/lib/libgstreamer-1.0.0.dylib
etc. See: #338 (comment 1554358)
Fixes #338 (closed)
Edited by Nirbheek Chauhan