Avoid changing cv-qualifier on override, should fix msvc warning

9 jobs for fix-msvc-warning in 4 minutes
Status Name Job ID Coverage
  Test
passed clang-c++11 #67569
Linux

00:03:37

passed cppcheck #67571
Linux

00:00:41

passed doc #67576
Linux

00:00:09

passed gcc-c++11 #67568
Linux

00:03:58

passed macos-c++11 #67570
Apple

00:03:01

passed VS2015-32-bit #67575
VS2015

00:01:08

passed VS2015-64-bit #67574
VS2015

00:01:17

passed VS2017-32-bit #67573
VS2017

00:01:12

passed VS2017-64-bit #67572
VS2015

00:01:18