Update OpenMesh to get VS2015 Update 3 fixes

9 jobs for VS2015_OM_fix in 80 minutes and 14 seconds
Status Job ID Name Coverage
  Test
passed #6965
MultiThreads Linux
clang-c++11-Qt4

00:06:59

passed #6969
MultiThreads Linux
clang-c++11-Qt5

00:09:24

passed #6967
MultiThreads Linux
clang-c++98-Qt4

00:06:06

passed #6971
MultiThreads Linux
clang-c++98-Qt5

00:06:47

passed #6972
MultiThreads Linux
cppcheck

00:34:13

passed #6964
Linux
gcc-c++11-Qt4

00:04:54

passed #6968
Linux
gcc-c++11-Qt5

00:04:43

passed #6966
Linux
gcc-c++98-Qt4

00:03:35

passed #6970
Linux
gcc-c++98-Qt5

00:03:27