tree 34962128b6ecc54dcf50d6b5d1020f2fa64ca575
parent f73914b3dec28dd557888806e41c6b82a0a65526
author Roland McGrath <mcgrathr@google.com> 1549802555 -0800
committer Roland McGrath <mcgrathr@google.com> 1550349960 -0800

[zircon] [gn] Produce legacy .pkg files, so far just for FIDL & Banjo

The legacy Fuchsia GN build consumes .pkg files describing Zircon things.
Start producing these.  First the simplest cases: FIDL and Banjo.
Also produce a manifest of all .pkg files.

Bug: BLD-325
Bug: BLD-353
Test: gn gen && ninja, manual examination of the .pkg files

Change-Id: I75e88803f992e4bceebf80e7799094b924cc8a09