math/asymptote: Udpate to 2.44

• Register the missing dependencies for USE_GL
• Add BDWGC (enable Boehm-Demers-Weiser garbage collector) option. At the moment, it is disabled by default to fix build on CURRENT and avoid breaking the interactive mode on 10.4
• Add USES=compiler:c++14-lang to fix segfault with 3D examples
• Use readline from ports
• Sort Makefile and cosmetic fixes
• Silence a explictly called command

Changelog: http://asymptote.sourceforge.net/ChangeLog

PR: 228667
Submitted by: cpm
Approved by: nivit (maintainer timeout, 2 weeks)
MFH: 2018Q2