Cvpcb link process: add missing openmp lib (used by 3d viewer since rev 5544)...

Cvpcb link process: add missing openmp lib (used by 3d viewer since rev 5544) in library list to link.

cvpcb/CMakeLists.txt

@@ -118,6 +118,7 @@ target_link_libraries( cvpcb_kiface
     gal
     ${wxWidgets_LIBRARIES}
     ${GDI_PLUS_LIBRARIES}
+    ${OPENMP_LIBRARIES}         # used by 3d viewer
     )
 
 if( BUILD_GITHUB_PLUGIN )