4.1-11: add upstream patch to build with -Wimplicit-fallthrough

Closes bug #943876
5 jobs for master in 20 minutes and 40 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Build
passed #392906
build

00:11:01

 
  Test
passed #392908
autopkgtest

00:03:25

passed #392909
blhc

00:01:10

passed #392907
allowed to fail
lintian

00:05:54

passed #392910
piuparts

00:09:37