devel/sope4: set LLD_UNSAFE

This port experiences odd failures with lld, so just fall back to
GNU ld.

amd64, lld 7.0:

ld: error: corrupt input file: version definition index 2 for symbol

undleManager.bundleSearchPaths is out of bounds

defined in ./../sope-core/NGExtensions/obj/libNGExtensions.so

i386, lld 6.0:

/usr/bin/ld: error: TLS attribute mismatch: _ThreadRuneLocale

PR: 214864, 230608
Approved by: portmgr (lld blanket)
Sponsored by: The FreeBSD Foundation