Don't search OpenVolumeMesh in OF core cmakefiles

7 jobs for CmakeLists_duplicate in 43 minutes and 55 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #24032
Apple
Mac-Cpp11

00:36:57

passed #24031
Qt551 VS2013
VS2013-Qt-5.5.1-x64

00:20:06

passed #24030
Qt56 VS2015
VS2015-Qt-5.6.0-x32

00:27:45

passed #24029
Qt56 VS2015
VS2015-Qt-5.6.0-x64

00:22:41

passed #24027
MultiThreads Linux
clang-c++11-Qt5

00:10:41

passed #24028
MultiThreads Linux
cppcheck

00:03:17

passed #24026
Linux
gcc-c++11-Qt5

00:03:00