Remove occconstruction.cpp from list of library sources
Remove occconstruction.cpp from list of library sources

Since commit 0c3c3f32d173b3f7edcb40f9f6447fae60f02c05
("occ build visualization mesh") occgeometry.cpp does not contain
any compiled code, and it has not been used at least for 12 years.

As the file includes quite some header files removing it from the sources
should save some compile time.

live-clones/netgen,live-clones/netgen,live-clones/netgen,live-clones/netgen,live-clones/netgen,live-clones/netgen