science/openbabel: Update to 2.4.1

Patches removed:

patch-git_c3abbdda, patch-gcc5-support (Integrated upstream)
patch-scripts__CMakeLists.txt (Builds without it)

While here, set LICENSE and simplify BUILD_DEPENDS.

Changes: https://github.com/openbabel/openbabel/releases

PR: 219382
Submitted by: Yuri Victorovich <yuri@rawbw.com>
Approved by: garga (mentor)
Differential Revision: https://reviews.freebsd.org/D10837