[FS#1038] Upgrade dnsmasq to 2.78 (security fixes for remote code execution)

[LEDE Bugs]

The following task is now closed:

FS#1038 - Upgrade dnsmasq to 2.78 (security fixes for remote code execution)
User who did this - Hans Dedecker (dedeckeh)

Reason for closing: Fixed
Additional comments about closing: Dnsmasq has been updated both in lede-17.01 (https://git.lede-project.org/?p=source.git;a=commit;h=4b4a4af814e1602f7ef12c5d07ff15c4fa2570ca) and trunk (https://git.lede-project.org/?p=source.git;a=commit;h=67ac017fefe8552b4e864d0494e892efe4fb9710) to 2.78.
Buildbots are in the process of making updated packages for dnsmasq; see http://lists.infradead.org/pipermail/lede-dev/2017-October/009143.html

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1038