build: osx: Fix incomplete framework packaging for codesigning

Starting with 10.9, Framework versions must be signed individually, rather
than as a single bundle version, in order to be properly codesigned. This
change ensures that the proper plist files and symlinks are present prior to
packaging.
Make script_{valid,invalid}.json validation flags configurable
Catch error when done reading files
Merge pull request #4758 from theuni/osx-dmg-codesign-rebase

build: osx: Fix incomplete framework packaging for codesigning
Merge pull request #4876

6022b5d Make script_{valid,invalid}.json validation flags configurable (Pieter Wuille)
Merge pull request #4896

07d5287 Catch error when done reading files (Suhas Daftuar)