Silence clang warning on unittest

21 jobs for Remove_Glut in 37 minutes and 29 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #66404
VS2015
VS2015-32-bit-shared-apps

00:07:36

passed #66405
VS2015
VS2015-32-bit-shared-no-apps

00:06:51

canceled #66408
VS2015
VS2015-32-bit-static-apps

canceled #66409
VS2015
VS2015-32-bit-static-no-apps

passed #66402
VS2015
VS2015-64-bit-shared-apps

00:09:04

passed #66403
VS2015
VS2015-64-bit-shared-no-apps

00:08:04

canceled #66406
VS2015
VS2015-64-bit-static-apps

00:02:36

canceled #66407
VS2015
VS2015-64-bit-static-no-apps

00:02:14

passed #66399
VS2017
VS2017-32-bit-shared-no-apps

00:06:20

passed #66401
VS2017
VS2017-32-bit-static-no-apps

00:06:59

passed #66396
Qt5101 VS2017
VS2017-64-bit-shared-apps

00:08:36

passed #66398
VS2017
VS2017-64-bit-shared-no-apps

00:08:41

passed #66397
Qt5101 VS2017
VS2017-64-bit-static-apps

00:09:16

passed #66400
VS2017
VS2017-64-bit-static-no-apps

00:08:54

canceled #66390
stretch Linux
clang-c++11

00:37:29

passed #66392
stretch Linux
clang-c++14

00:19:49

passed #66395
stretch Linux
cppcheck

00:00:08

passed #66389
stretch Linux
gcc-c++11

00:03:37

passed #66391
stretch Linux
gcc-c++14

00:03:02

passed #66393
Apple
macos-c++11

00:14:04

passed #66394
Apple
macos-c++98

00:25:31