pkg: use a blob buffer in pkg_t to store variable fields
authorJo-Philipp Wich <jo@mein.io>
Fri, 10 Feb 2017 16:14:53 +0000 (17:14 +0100)
committerJo-Philipp Wich <jo@mein.io>
Mon, 13 Feb 2017 15:52:56 +0000 (16:52 +0100)
Adds infrastructure to use a blob buffer in pkg_t to store and retrieve
optional dynamic fields.

This reduces the size of the pkg_t structure itself and lays the
ground work for further optimization.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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