There is no possibility to switch over to use system version of coinmp. We should allow distro packagers to use system version of it.
A patch exists in master but not in 4.3 branch: http://cgit.freedesktop.org/libreoffice/core/commit/?id=d85f513934bb5735a2c0c343fbe7dc2b9c11af3e Seems to work fine.
Yes, I can build master fine with system coinmp