Fixed CI on Windows

9 jobs from CI-fix in 3 minutes and 59 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #37727
VS2013
VS2013-32-bit

00:00:55

passed #37726
VS2013
VS2013-64-bit

00:00:56

passed #37725
VS2015
VS2015-32-bit

00:01:08

passed #37724
VS2015
VS2015-64-bit

00:01:19

passed #37721
Linux
clang-c++11

00:03:45

passed #37723
Linux
cppcheck

00:00:26

passed #37728
Linux
doc

00:00:19

passed #37720
Linux
gcc-c++11

00:03:59

passed #37722
Apple
macos-c++11

00:01:41