'm fuzz' shared lib package should be per-fuzzer.

Change the ClusterFuzz package built by 'make fuzz' to now package
shared libraries per-fuzz target.

Changes documented in go/proposed-clusterfuzz-package

This has the impact of:
 - This package is much easier to post-process in the Haiku export
 cronjob.
 - Shared libraries are now per-fuzz-target. This means that we will
 have some level of duplication (libdl, libc, libc++, libclang_rt.*,
 etc.) as these libraries will be in multiple fuzz target's dirs.

This *only* affects the fuzz-$target-$arch.zip file, not the fuzz targets in
$ANDROID_HOST_OUT/fuzz or $ANDROID_PRODUCT_OUT/data/fuzz. These two
install directories still use the global shared libraries in order to
preserve space on devices.

Bug: 144360679
Test: m fuzz
Change-Id: I5f19a13070e01d2d39598f9f215a983b398a9f37