OPNSense/core 9c927cdsrc/etc/inc interfaces.inc

interfaces: get pfsync0 mtu from real interface

(cherry picked from commit 15acbad935feff843b201b3379c744173a588441)
(cherry picked from commit a1a153946a8849a7459b1e83909177f72c6cce93)
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+8-2src/etc/inc/interfaces.inc
+8-21 files

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