cmake: Link against libjson-c
authorFlorian Fainelli <f.fainelli@gmail.com>
Fri, 1 Jul 2016 23:06:42 +0000 (16:06 -0700)
committerJohn Crispin <john@phrozen.org>
Fri, 1 Jul 2016 13:25:47 +0000 (15:25 +0200)
block uses libblob_msgjson which requires us to link against libjson-c.
Some external toolchains would be failing to find that library unless
specified explicitly.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

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