smath/cgal: Update to 5.0.2

The new version of CGAL brings improvements and a lot of changes, including 2 major ones [1](header only[2] and require c++14) requiring to patch all software depending on it.

[1] https://www.cgal.org/2019/11/08/cgal50/
[2] https://doc.cgal.org/latest/Manual/installation.html

math/cgal:

• Update to 5.0.2

databases/sfcgal:

• Fix with cgal5 : use c++14 and add gmpxx link

databases/postgis*:

• bump portversion needed due to cgal and sfcgal changes

cad/openscad:

• remove LIB_DEPENDS and add BUILD_DEPENDS
• Use c++14

cad/openscad-devel:

• remove LIB_DEPENDS and add BUILD_DEPENDS
• Use c++14

games/flightgear-terragear:

• remove LIB_DEPENDS and add BUILD_DEPENDS
• fix Boost error (ld: error: undefined symbol: boost::thread::hardware_concurrency())

graphics/colmap:

• remove LIB_DEPENDS and add BUILD_DEPENDS
• fix CMAKE_CXX_FLAGS with c++14

PR: 245824
Approved by: wen, jbeich, tcberner (mentor)
Differential Revision: D24578